251500292513 has 2 divisors, whose sum is σ = 251500292514. Its totient is φ = 251500292512.

The previous prime is 251500292471. The next prime is 251500292531. The reversal of 251500292513 is 315292005152.

Together with next prime (251500292531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180087350689 + 71412941824 = 424367^2 + 267232^2 .

It is a cyclic number.

It is not a de Polignac number, because 251500292513 - 2⁸ = 251500292257 is a prime.

It is not a weakly prime, because it can be changed into another prime (251500252513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125750146256 + 125750146257.

It is an arithmetic number, because the mean of its divisors is an integer number (125750146257).

Almost surely, 2^251500292513 is an apocalyptic number.

It is an amenable number.

251500292513 is a deficient number, since it is larger than the sum of its proper divisors (1).

251500292513 is an equidigital number, since it uses as much as digits as its factorization.

251500292513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

Adding to 251500292513 its reverse (315292005152), we get a palindrome (566792297665).

The spelling of 251500292513 in words is "two hundred fifty-one billion, five hundred million, two hundred ninety-two thousand, five hundred thirteen".