117517731 has 16 divisors (see below), whose sum is σ = 158976384. Its totient is φ = 77209344.

The previous prime is 117517727. The next prime is 117517739. The reversal of 117517731 is 137715711.

It is not a de Polignac number, because 117517731 - 2² = 117517727 is a prime.

It is a super-2 number, since 2×117517731² = 27620834198776722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 117517692 and 117517701.

It is not an unprimeable number, because it can be changed into a prime (117517739) 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, 81640 + ... + 83066.

It is an arithmetic number, because the mean of its divisors is an integer number (9936024).

Almost surely, 2^117517731 is an apocalyptic number.

117517731 is a deficient number, since it is larger than the sum of its proper divisors (41458653).

117517731 is a wasteful number, since it uses less digits than its factorization.

117517731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810.

The product of its digits is 5145, while the sum is 33.

The square root of 117517731 is about 10840.5595335296. The cubic root of 117517731 is about 489.8176900566.

The spelling of 117517731 in words is "one hundred seventeen million, five hundred seventeen thousand, seven hundred thirty-one".