249 (number)

249 (two hundred [and] forty-nine) is the natural number following 248 and preceding 250.

← 248 249 250 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred forty-nine
Ordinal	249th (two hundred and forty-ninth)
Factorization	3 × 83
Roman numeral	CCXLIX
Binary	111110012
Ternary	1000203
Quaternary	33214
Quinary	14445
Senary	10536
Octal	3718
Duodecimal	18912
Hexadecimal	F916
Vigesimal	C920
Base 36	6X36

In mathematics

249 is:

• a Blum integer.^[1]
• a semiprime.
• palindromic in bases 82 (33₈₂) and 248 (11₂₄₈).
• a Harshad number in bases 3, 83, 84, 124, 167 and 247.
• the aliquot sum of any of these numbers: 375, 531, 1687, 4351, 7807, 12127, 14647 and 15151.
• part of the 3-aliquot tree. The aliquot sequence starting at 288 is: 288, 531, 249, 87, 33, 15, 9, 4, 3, 1, 0.

References

1. "Sloane's A016105 : Blum integers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.