1251252513 has 48 divisors (see below), whose sum is σ = 2211805440. Its totient is φ = 665330688.

The previous prime is 1251252511. The next prime is 1251252553. The reversal of 1251252513 is 3152521521.

1251252513 is a `hidden beast` number, since 1 + 25 + 125 + 2 + 513 = 666.

It is not a de Polignac number, because 1251252513 - 2¹ = 1251252511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251252511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88756 + ... + 101882.

It is an arithmetic number, because the mean of its divisors is an integer number (46079280).

Almost surely, 2^1251252513 is an apocalyptic number.

It is an amenable number.

1251252513 is a deficient number, since it is larger than the sum of its proper divisors (960552927).

1251252513 is a wasteful number, since it uses less digits than its factorization.

1251252513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13246 (or 13243 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 1251252513 is about 35373.0478330607. The cubic root of 1251252513 is about 1077.5770192378.

It can be divided in two parts, 12512 and 52513, that added together give a square (65025 = 255²).

The spelling of 1251252513 in words is "one billion, two hundred fifty-one million, two hundred fifty-two thousand, five hundred thirteen".