231403431 has 12 divisors (see below), whose sum is σ = 358911672. Its totient is φ = 132230448.

The previous prime is 231403429. The next prime is 231403453. The reversal of 231403431 is 134304132.

It is not a de Polignac number, because 231403431 - 2¹ = 231403429 is a prime.

It is a super-2 number, since 2×231403431² = 107095095757143522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 231403398 and 231403407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231403411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 786940 + ... + 787233.

It is an arithmetic number, because the mean of its divisors is an integer number (29909306).

Almost surely, 2^231403431 is an apocalyptic number.

231403431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231403431 is a deficient number, since it is larger than the sum of its proper divisors (127508241).

231403431 is a wasteful number, since it uses less digits than its factorization.

231403431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574190 (or 1574183 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 231403431 is about 15211.9502694428. The cubic root of 231403431 is about 613.9362323120.

Adding to 231403431 its reverse (134304132), we get a palindrome (365707563).

The spelling of 231403431 in words is "two hundred thirty-one million, four hundred three thousand, four hundred thirty-one".