231404440424431 has 4 divisors (see below), whose sum is σ = 232423843245912. Its totient is φ = 230385037602952.

The previous prime is 231404440424393. The next prime is 231404440424459. The reversal of 231404440424431 is 134424044404132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231404440424431 is a prime.

It is a super-2 number, since 2×231404440424431² (a number of 30 digits) 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 (231404440422431) 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, 509701410400 + ... + 509701410853.

It is an arithmetic number, because the mean of its divisors is an integer number (58105960811478).

Almost surely, 2^{231404440424431} is an apocalyptic number.

231404440424431 is a deficient number, since it is larger than the sum of its proper divisors (1019402821481).

231404440424431 is a wasteful number, since it uses less digits than its factorization.

231404440424431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019402821480.

The product of its (nonzero) digits is 589824, while the sum is 40.

Adding to 231404440424431 its reverse (134424044404132), we get a palindrome (365828484828563).

The spelling of 231404440424431 in words is "two hundred thirty-one trillion, four hundred four billion, four hundred forty million, four hundred twenty-four thousand, four hundred thirty-one".