251278319297 has 2 divisors, whose sum is σ = 251278319298. Its totient is φ = 251278319296.

The previous prime is 251278319287. The next prime is 251278319309. The reversal of 251278319297 is 792913872152.

251278319297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231939523201 + 19338796096 = 481601^2 + 139064^2 .

It is a cyclic number.

It is not a de Polignac number, because 251278319297 - 2⁶ = 251278319233 is a prime.

It is not a weakly prime, because it can be changed into another prime (251278319287) 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, 125639159648 + 125639159649.

It is an arithmetic number, because the mean of its divisors is an integer number (125639159649).

Almost surely, 2^251278319297 is an apocalyptic number.

It is an amenable number.

251278319297 is a deficient number, since it is larger than the sum of its proper divisors (1).

251278319297 is an equidigital number, since it uses as much as digits as its factorization.

251278319297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 56.

The spelling of 251278319297 in words is "two hundred fifty-one billion, two hundred seventy-eight million, three hundred nineteen thousand, two hundred ninety-seven".