1251115256 has 16 divisors (see below), whose sum is σ = 2346230040. Its totient is φ = 625453920.

The previous prime is 1251115253. The next prime is 1251115277. The reversal of 1251115256 is 6525111521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251115253) 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, 68186 + ... + 84566.

Almost surely, 2^1251115256 is an apocalyptic number.

It is an amenable number.

1251115256 is a deficient number, since it is larger than the sum of its proper divisors (1095114784).

1251115256 is a wasteful number, since it uses less digits than its factorization.

1251115256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25934 (or 25930 counting only the distinct ones).

The product of its digits is 3000, while the sum is 29.

The square root of 1251115256 is about 35371.1076445169. The cubic root of 1251115256 is about 1077.5376159477.

Adding to 1251115256 its reverse (6525111521), we get a palindrome (7776226777).

The spelling of 1251115256 in words is "one billion, two hundred fifty-one million, one hundred fifteen thousand, two hundred fifty-six".