251379013 has 2 divisors, whose sum is σ = 251379014. Its totient is φ = 251379012.

The previous prime is 251378993. The next prime is 251379041. The reversal of 251379013 is 310973152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155201764 + 96177249 = 12458^2 + 9807^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251379013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251379043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125689506 + 125689507.

It is an arithmetic number, because the mean of its divisors is an integer number (125689507).

Almost surely, 2^251379013 is an apocalyptic number.

It is an amenable number.

251379013 is a deficient number, since it is larger than the sum of its proper divisors (1).

251379013 is an equidigital number, since it uses as much as digits as its factorization.

251379013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 251379013 is about 15854.9365498573. The cubic root of 251379013 is about 631.1167000433.

The spelling of 251379013 in words is "two hundred fifty-one million, three hundred seventy-nine thousand, thirteen".