231677631 has 8 divisors (see below), whose sum is σ = 343226160. Its totient is φ = 154451736.

The previous prime is 231677627. The next prime is 231677653. The reversal of 231677631 is 136776132.

231677631 is a `hidden beast` number, since 2 + 3 + 16 + 7 + 7 + 631 = 666.

It is not a de Polignac number, because 231677631 - 2² = 231677627 is a prime.

It is a super-2 number, since 2×231677631² = 107349049411544322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231677531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4290300 + ... + 4290353.

It is an arithmetic number, because the mean of its divisors is an integer number (42903270).

Almost surely, 2^231677631 is an apocalyptic number.

231677631 is a deficient number, since it is larger than the sum of its proper divisors (111548529).

231677631 is an equidigital number, since it uses as much as digits as its factorization.

231677631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580662 (or 8580656 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 231677631 is about 15220.9602522311. The cubic root of 231677631 is about 614.1786298516.

The spelling of 231677631 in words is "two hundred thirty-one million, six hundred seventy-seven thousand, six hundred thirty-one".