251351013 has 4 divisors (see below), whose sum is σ = 335134688. Its totient is φ = 167567340.

The previous prime is 251350997. The next prime is 251351047. The reversal of 251351013 is 310153152.

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 not a de Polignac number, because 251351013 - 2⁴ = 251350997 is a prime.

It is a super-2 number, since 2×251351013² = 126354663472252338, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251351063) 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, 41891833 + ... + 41891838.

It is an arithmetic number, because the mean of its divisors is an integer number (83783672).

Almost surely, 2^251351013 is an apocalyptic number.

It is an amenable number.

251351013 is a deficient number, since it is larger than the sum of its proper divisors (83783675).

251351013 is an equidigital number, since it uses as much as digits as its factorization.

251351013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83783674.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 251351013 is about 15854.0535195262. The cubic root of 251351013 is about 631.0932667376.

The spelling of 251351013 in words is "two hundred fifty-one million, three hundred fifty-one thousand, thirteen".