118505531 has 4 divisors (see below), whose sum is σ = 118528200. Its totient is φ = 118482864.

The previous prime is 118505507. The next prime is 118505533. The reversal of 118505531 is 135505811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 118505531 - 2²² = 114311227 is a prime.

It is a super-2 number, since 2×118505531² = 28087121755183922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 118505494 and 118505503.

It is not an unprimeable number, because it can be changed into a prime (118505533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 935 + ... + 15423.

It is an arithmetic number, because the mean of its divisors is an integer number (29632050).

Almost surely, 2^118505531 is an apocalyptic number.

118505531 is a deficient number, since it is larger than the sum of its proper divisors (22669).

118505531 is an equidigital number, since it uses as much as digits as its factorization.

118505531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22668.

The product of its (nonzero) digits is 3000, while the sum is 29.

The square root of 118505531 is about 10886.0245728181. The cubic root of 118505531 is about 491.1862567530.

The spelling of 118505531 in words is "one hundred eighteen million, five hundred five thousand, five hundred thirty-one".