117561731 has 12 divisors (see below), whose sum is σ = 136936800. Its totient is φ = 100633680.

The previous prime is 117561713. The next prime is 117561739. The reversal of 117561731 is 137165711.

It is a de Polignac number, because none of the positive numbers 2^k-117561731 is a prime.

It is a super-2 number, since 2×117561731² = 27641521191432722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117561739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59345 + ... + 61293.

It is an arithmetic number, because the mean of its divisors is an integer number (11411400).

Almost surely, 2^117561731 is an apocalyptic number.

117561731 is a deficient number, since it is larger than the sum of its proper divisors (19375069).

117561731 is a wasteful number, since it uses less digits than its factorization.

117561731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194 (or 3187 counting only the distinct ones).

The product of its digits is 4410, while the sum is 32.

The square root of 117561731 is about 10842.5887591479. The cubic root of 117561731 is about 489.8788135681.

The spelling of 117561731 in words is "one hundred seventeen million, five hundred sixty-one thousand, seven hundred thirty-one".