117181531 has 8 divisors (see below), whose sum is σ = 123678720. Its totient is φ = 110717352.

The previous prime is 117181523. The next prime is 117181543. The reversal of 117181531 is 135181711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 117181531 - 2³ = 117181523 is a prime.

It is a super-2 number, since 2×117181531² = 27463022415007922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117181531.

It is not an unprimeable number, because it can be changed into a prime (117181501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775 + ... + 15328.

It is an arithmetic number, because the mean of its divisors is an integer number (15459840).

Almost surely, 2^117181531 is an apocalyptic number.

117181531 is a deficient number, since it is larger than the sum of its proper divisors (6497189).

117181531 is a wasteful number, since it uses less digits than its factorization.

117181531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16505.

The product of its digits is 840, while the sum is 28.

The square root of 117181531 is about 10825.0418474942. The cubic root of 117181531 is about 489.3501464379.

The spelling of 117181531 in words is "one hundred seventeen million, one hundred eighty-one thousand, five hundred thirty-one".