1231230256 has 20 divisors (see below), whose sum is σ = 2388041352. Its totient is φ = 614961536.

The previous prime is 1231230211. The next prime is 1231230263. The reversal of 1231230256 is 6520321321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231230256.

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, 25126 + ... + 55621.

Almost surely, 2^1231230256 is an apocalyptic number.

1231230256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1231230256 is a deficient number, since it is larger than the sum of its proper divisors (1156811096).

1231230256 is an equidigital number, since it uses as much as digits as its factorization.

1231230256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81708 (or 81702 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1231230256 is about 35088.8907775666. The cubic root of 1231230256 is about 1071.7983720813.

Adding to 1231230256 its reverse (6520321321), we get a palindrome (7751551577).

The spelling of 1231230256 in words is "one billion, two hundred thirty-one million, two hundred thirty thousand, two hundred fifty-six".