231316631 has 8 divisors (see below), whose sum is σ = 284697504. Its totient is φ = 183019680.

The previous prime is 231316627. The next prime is 231316667. The reversal of 231316631 is 136613132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231316631 - 2² = 231316627 is a prime.

It is a super-2 number, since 2×231316631² = 107014767554380322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231316631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231316031) 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, 1270880 + ... + 1271061.

It is an arithmetic number, because the mean of its divisors is an integer number (35587188).

Almost surely, 2^231316631 is an apocalyptic number.

231316631 is a deficient number, since it is larger than the sum of its proper divisors (53380873).

231316631 is a wasteful number, since it uses less digits than its factorization.

231316631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541961.

The product of its digits is 1944, while the sum is 26.

The square root of 231316631 is about 15209.0969817409. The cubic root of 231316631 is about 613.8594597117.

Adding to 231316631 its reverse (136613132), we get a palindrome (367929763).

The spelling of 231316631 in words is "two hundred thirty-one million, three hundred sixteen thousand, six hundred thirty-one".