251320590457 has 2 divisors, whose sum is σ = 251320590458. Its totient is φ = 251320590456.

The previous prime is 251320590427. The next prime is 251320590473. The reversal of 251320590457 is 754095023152.

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., 213299880336 + 38020710121 = 461844^2 + 194989^2 .

It is a cyclic number.

It is not a de Polignac number, because 251320590457 - 2³⁵ = 216960852089 is a prime.

It is not a weakly prime, because it can be changed into another prime (251320590407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125660295228 + 125660295229.

It is an arithmetic number, because the mean of its divisors is an integer number (125660295229).

Almost surely, 2^251320590457 is an apocalyptic number.

It is an amenable number.

251320590457 is a deficient number, since it is larger than the sum of its proper divisors (1).

251320590457 is an equidigital number, since it uses as much as digits as its factorization.

251320590457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 251320590457 in words is "two hundred fifty-one billion, three hundred twenty million, five hundred ninety thousand, four hundred fifty-seven".