231400631 has 32 divisors (see below), whose sum is σ = 303049728. Its totient is φ = 171325440.

The previous prime is 231400591. The next prime is 231400643. The reversal of 231400631 is 136004132.

It is not a de Polignac number, because 231400631 - 2⁶ = 231400567 is a prime.

It is a super-2 number, since 2×231400631² = 107092504054396322, 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 (231400691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341465 + ... + 342141.

It is an arithmetic number, because the mean of its divisors is an integer number (9470304).

Almost surely, 2^231400631 is an apocalyptic number.

231400631 is a deficient number, since it is larger than the sum of its proper divisors (71649097).

231400631 is a wasteful number, since it uses less digits than its factorization.

231400631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 231400631 is about 15211.8582362577. The cubic root of 231400631 is about 613.9337560762.

Adding to 231400631 its reverse (136004132), we get a palindrome (367404763).

The spelling of 231400631 in words is "two hundred thirty-one million, four hundred thousand, six hundred thirty-one".