1251355525 has 24 divisors (see below), whose sum is σ = 1802436224. Its totient is φ = 843998400.

The previous prime is 1251355507. The next prime is 1251355529. The reversal of 1251355525 is 5255531521.

It is not a de Polignac number, because 1251355525 - 2²⁵ = 1217801093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251355529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47937 + ... + 69286.

Almost surely, 2^1251355525 is an apocalyptic number.

It is an amenable number.

1251355525 is a deficient number, since it is larger than the sum of its proper divisors (551080699).

1251355525 is a wasteful number, since it uses less digits than its factorization.

1251355525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117301 (or 117296 counting only the distinct ones).

The product of its digits is 37500, while the sum is 34.

The square root of 1251355525 is about 35374.5038834469. The cubic root of 1251355525 is about 1077.6065896927.

The spelling of 1251355525 in words is "one billion, two hundred fifty-one million, three hundred fifty-five thousand, five hundred twenty-five".