231120531 has 24 divisors (see below), whose sum is σ = 345371520. Its totient is φ = 148780800.

The previous prime is 231120511. The next prime is 231120553. The reversal of 231120531 is 135021132.

231120531 is a `hidden beast` number, since 23 + 112 + 0 + 531 = 666.

It is not a de Polignac number, because 231120531 - 2⁶ = 231120467 is a prime.

It is a super-2 number, since 2×231120531² = 106833399699443922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231120511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 228555 + ... + 229563.

It is an arithmetic number, because the mean of its divisors is an integer number (14390480).

Almost surely, 2^231120531 is an apocalyptic number.

231120531 is a deficient number, since it is larger than the sum of its proper divisors (114250989).

231120531 is a wasteful number, since it uses less digits than its factorization.

231120531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867 (or 1864 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 231120531 is about 15202.6488152558. The cubic root of 231120531 is about 613.6859430438.

Adding to 231120531 its reverse (135021132), we get a palindrome (366141663).

The spelling of 231120531 in words is "two hundred thirty-one million, one hundred twenty thousand, five hundred thirty-one".