251492435617 has 2 divisors, whose sum is σ = 251492435618. Its totient is φ = 251492435616.

The previous prime is 251492435573. The next prime is 251492435819. The reversal of 251492435617 is 716534294152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242173236321 + 9319199296 = 492111^2 + 96536^2 .

It is a cyclic number.

It is not a de Polignac number, because 251492435617 - 2²⁷ = 251358217889 is a prime.

It is not a weakly prime, because it can be changed into another prime (251492430617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125746217808 + 125746217809.

It is an arithmetic number, because the mean of its divisors is an integer number (125746217809).

Almost surely, 2^251492435617 is an apocalyptic number.

It is an amenable number.

251492435617 is a deficient number, since it is larger than the sum of its proper divisors (1).

251492435617 is an equidigital number, since it uses as much as digits as its factorization.

251492435617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 49.

The spelling of 251492435617 in words is "two hundred fifty-one billion, four hundred ninety-two million, four hundred thirty-five thousand, six hundred seventeen".