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117996281 = 139076637
BaseRepresentation
bin1110000100001…
…11101011111001
322020000211110122
413002013223321
5220201340111
615413023025
72631644324
oct702075371
9266024418
10117996281
1160673397
1233624a75
131b5a4bb0
14119577bb
15a55bcdb
hex7087af9

117996281 has 4 divisors (see below), whose sum is σ = 127072932. Its totient is φ = 108919632.

The previous prime is 117996271. The next prime is 117996299. The reversal of 117996281 is 182699711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182699711 = 199918089.

It can be written as a sum of positive squares in 2 ways, for example, as 19669225 + 98327056 = 4435^2 + 9916^2 .

It is a cyclic number.

It is not a de Polignac number, because 117996281 - 218 = 117734137 is a prime.

It is a super-2 number, since 2×1179962812 = 27846244659661922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117996211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4538306 + ... + 4538331.

It is an arithmetic number, because the mean of its divisors is an integer number (31768233).

Almost surely, 2117996281 is an apocalyptic number.

It is an amenable number.

117996281 is a deficient number, since it is larger than the sum of its proper divisors (9076651).

117996281 is an equidigital number, since it uses as much as digits as its factorization.

117996281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9076650.

The product of its digits is 54432, while the sum is 44.

The square root of 117996281 is about 10862.6093090012. The cubic root of 117996281 is about 490.4816602156.

The spelling of 117996281 in words is "one hundred seventeen million, nine hundred ninety-six thousand, two hundred eighty-one".

Divisors: 1 13 9076637 117996281