251004013 has 4 divisors (see below), whose sum is σ = 270312028. Its totient is φ = 231696000.

The previous prime is 251004007. The next prime is 251004049. The reversal of 251004013 is 310400152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37785609 + 213218404 = 6147^2 + 14602^2 .

It is a cyclic number.

It is not a de Polignac number, because 251004013 - 2⁵ = 251003981 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 (251004053) 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, 9653988 + ... + 9654013.

It is an arithmetic number, because the mean of its divisors is an integer number (67578007).

Almost surely, 2^251004013 is an apocalyptic number.

It is an amenable number.

251004013 is a deficient number, since it is larger than the sum of its proper divisors (19308015).

251004013 is a wasteful number, since it uses less digits than its factorization.

251004013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19308014.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 251004013 is about 15843.1061664056. The cubic root of 251004013 is about 630.8027165985.

Adding to 251004013 its reverse (310400152), we get a palindrome (561404165).

The spelling of 251004013 in words is "two hundred fifty-one million, four thousand, thirteen".