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# 249 (number)

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

 ← 248 249 250 →
Cardinaltwo hundred forty-nine
Ordinal249th
(two hundred forty-ninth)
Factorization3 × 83
Greek numeralΣΜΘ´
Roman numeralCCXLIX
Binary111110012
Ternary1000203
Quaternary33214
Quinary14445
Senary10536
Octal3718
Duodecimal18912
VigesimalC920
Base 366X36

## 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.