231404631 has 8 divisors (see below), whose sum is σ = 310583424. Its totient is φ = 153247800.

The previous prime is 231404603. The next prime is 231404651. The reversal of 231404631 is 136404132.

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

It is not a de Polignac number, because 231404631 - 2¹¹ = 231402583 is a prime.

It is a super-2 number, since 2×231404631² = 107096206496492322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231404651) 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 7 ways as a sum of consecutive naturals, for example, 254961 + ... + 255866.

It is an arithmetic number, because the mean of its divisors is an integer number (38822928).

Almost surely, 2^231404631 is an apocalyptic number.

231404631 is a deficient number, since it is larger than the sum of its proper divisors (79178793).

231404631 is a wasteful number, since it uses less digits than its factorization.

231404631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510981.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 231404631 is about 15211.9897120659. The cubic root of 231404631 is about 613.9372935498.

Adding to 231404631 its reverse (136404132), we get a palindrome (367808763).

The spelling of 231404631 in words is "two hundred thirty-one million, four hundred four thousand, six hundred thirty-one".