1231000256 has 28 divisors (see below), whose sum is σ = 2444419800. Its totient is φ = 615083520.

The previous prime is 1231000237. The next prime is 1231000261. The reversal of 1231000256 is 6520001321.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103076 + ... + 114396.

Almost surely, 2^1231000256 is an apocalyptic number.

1231000256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1231000256 is a deficient number, since it is larger than the sum of its proper divisors (1213419544).

1231000256 is a wasteful number, since it uses less digits than its factorization.

1231000256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13032 (or 13022 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1231000256 is about 35085.6132339168. The cubic root of 1231000256 is about 1071.7316288175.

Adding to 1231000256 its reverse (6520001321), we get a palindrome (7751001577).

The spelling of 1231000256 in words is "one billion, two hundred thirty-one million, two hundred fifty-six", and thus it is an aban number.