117531 has 10 divisors (see below), whose sum is σ = 175692. Its totient is φ = 78300.

The previous prime is 117529. The next prime is 117539. The reversal of 117531 is 135711.

It is a happy number.

It is not a de Polignac number, because 117531 - 2¹ = 117529 is a prime.

It is a super-2 number, since 2×117531² = 27627071922, which contains 22 as substring.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (117539) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 645 + ... + 806.

2¹¹⁷⁵³¹ is an apocalyptic number.

117531 is a deficient number, since it is larger than the sum of its proper divisors (58161).

117531 is an equidigital number, since it uses as much as digits as its factorization.

117531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463 (or 1454 counting only the distinct ones).

The product of its digits is 105, while the sum is 18.

The square root of 117531 is about 342.8279451853. The cubic root of 117531 is about 48.9836124569.

The spelling of 117531 in words is "one hundred seventeen thousand, five hundred thirty-one".