231347631 has 4 divisors (see below), whose sum is σ = 308463512. Its totient is φ = 154231752.

The previous prime is 231347621. The next prime is 231347651. The reversal of 231347631 is 136743132.

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

It is not a de Polignac number, because 231347631 - 2⁹ = 231347119 is a prime.

It is a super-2 number, since 2×231347631² = 107043452738624322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231347621) 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, 38557936 + ... + 38557941.

It is an arithmetic number, because the mean of its divisors is an integer number (77115878).

Almost surely, 2^231347631 is an apocalyptic number.

231347631 is a deficient number, since it is larger than the sum of its proper divisors (77115881).

231347631 is an equidigital number, since it uses as much as digits as its factorization.

231347631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77115880.

The product of its digits is 9072, while the sum is 30.

The square root of 231347631 is about 15210.1160745078. The cubic root of 231347631 is about 613.8868807019.

The spelling of 231347631 in words is "two hundred thirty-one million, three hundred forty-seven thousand, six hundred thirty-one".