231969931 has 4 divisors (see below), whose sum is σ = 239452864. Its totient is φ = 224487000.

The previous prime is 231969929. The next prime is 231969937. The reversal of 231969931 is 139969132.

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 231969931 - 2¹ = 231969929 is a prime.

It is a super-2 number, since 2×231969931² = 107620097776289522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231969937) 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, 3741420 + ... + 3741481.

It is an arithmetic number, because the mean of its divisors is an integer number (59863216).

Almost surely, 2^231969931 is an apocalyptic number.

231969931 is a deficient number, since it is larger than the sum of its proper divisors (7482933).

231969931 is an equidigital number, since it uses as much as digits as its factorization.

231969931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7482932.

The product of its digits is 78732, while the sum is 43.

The square root of 231969931 is about 15230.5591164606. The cubic root of 231969931 is about 614.4368175837.

The spelling of 231969931 in words is "two hundred thirty-one million, nine hundred sixty-nine thousand, nine hundred thirty-one".