117681531 has 16 divisors (see below), whose sum is σ = 181243008. Its totient is φ = 67126400.

The previous prime is 117681527. The next prime is 117681559. The reversal of 117681531 is 135186711.

It is not a de Polignac number, because 117681531 - 2² = 117681527 is a prime.

It is a super-2 number, since 2×117681531² = 27697885477007922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 117681492 and 117681501.

It is not an unprimeable number, because it can be changed into a prime (117681131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104325 + ... + 105446.

It is an arithmetic number, because the mean of its divisors is an integer number (11327688).

Almost surely, 2^117681531 is an apocalyptic number.

117681531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

117681531 is a deficient number, since it is larger than the sum of its proper divisors (63561477).

117681531 is a wasteful number, since it uses less digits than its factorization.

117681531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209802.

The product of its digits is 5040, while the sum is 33.

The square root of 117681531 is about 10848.1118633613. Note that the first 3 decimals coincide. The cubic root of 117681531 is about 490.0451589644.

The spelling of 117681531 in words is "one hundred seventeen million, six hundred eighty-one thousand, five hundred thirty-one".