251339713117 has 2 divisors, whose sum is σ = 251339713118. Its totient is φ = 251339713116.

The previous prime is 251339713081. The next prime is 251339713133. The reversal of 251339713117 is 711317933152.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214159775076 + 37179938041 = 462774^2 + 192821^2 .

It is a cyclic number.

It is not a de Polignac number, because 251339713117 - 2¹⁵ = 251339680349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251339713147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125669856558 + 125669856559.

It is an arithmetic number, because the mean of its divisors is an integer number (125669856559).

Almost surely, 2^251339713117 is an apocalyptic number.

It is an amenable number.

251339713117 is a deficient number, since it is larger than the sum of its proper divisors (1).

251339713117 is an equidigital number, since it uses as much as digits as its factorization.

251339713117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 43.

The spelling of 251339713117 in words is "two hundred fifty-one billion, three hundred thirty-nine million, seven hundred thirteen thousand, one hundred seventeen".