251552013 has 4 divisors (see below), whose sum is σ = 335402688. Its totient is φ = 167701340.

The previous prime is 251551997. The next prime is 251552023. The reversal of 251552013 is 310255152.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251552013 - 2⁴ = 251551997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251552023) 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, 41925333 + ... + 41925338.

It is an arithmetic number, because the mean of its divisors is an integer number (83850672).

Almost surely, 2^251552013 is an apocalyptic number.

It is an amenable number.

251552013 is a deficient number, since it is larger than the sum of its proper divisors (83850675).

251552013 is an equidigital number, since it uses as much as digits as its factorization.

251552013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83850674.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 251552013 is about 15860.3913255632. The cubic root of 251552013 is about 631.2614458206.

The spelling of 251552013 in words is "two hundred fifty-one million, five hundred fifty-two thousand, thirteen".