231625631 has 4 divisors (see below), whose sum is σ = 231787152. Its totient is φ = 231464112.

The previous prime is 231625627. The next prime is 231625657. The reversal of 231625631 is 136526132.

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 231625631 - 2² = 231625627 is a prime.

It is a super-2 number, since 2×231625631² = 107300865872296322, 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 = 231625594 and 231625603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231625531) 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, 78590 + ... + 81483.

It is an arithmetic number, because the mean of its divisors is an integer number (57946788).

Almost surely, 2^231625631 is an apocalyptic number.

231625631 is a deficient number, since it is larger than the sum of its proper divisors (161521).

231625631 is a wasteful number, since it uses less digits than its factorization.

231625631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161520.

The product of its digits is 6480, while the sum is 29.

The square root of 231625631 is about 15219.2519855609. The cubic root of 231625631 is about 614.1326756546.

The spelling of 231625631 in words is "two hundred thirty-one million, six hundred twenty-five thousand, six hundred thirty-one".