1231431256 has 32 divisors (see below), whose sum is σ = 2566371600. Its totient is φ = 549178240.

The previous prime is 1231431251. The next prime is 1231431277. The reversal of 1231431256 is 6521341321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231431251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127351 + ... + 136678.

Almost surely, 2^1231431256 is an apocalyptic number.

It is an amenable number.

1231431256 is an abundant number, since it is smaller than the sum of its proper divisors (1334940344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231431256 is a wasteful number, since it uses less digits than its factorization.

1231431256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264099 (or 264095 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 1231431256 is about 35091.7548150559. The cubic root of 1231431256 is about 1071.8566930844.

Adding to 1231431256 its reverse (6521341321), we get a palindrome (7752772577).

The spelling of 1231431256 in words is "one billion, two hundred thirty-one million, four hundred thirty-one thousand, two hundred fifty-six".