257245321 has 2 divisors, whose sum is σ = 257245322. Its totient is φ = 257245320.

The previous prime is 257245301. The next prime is 257245379. The reversal of 257245321 is 123542752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232989696 + 24255625 = 15264^2 + 4925^2 .

It is a cyclic number.

It is not a de Polignac number, because 257245321 - 2⁹ = 257244809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257245301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128622660 + 128622661.

It is an arithmetic number, because the mean of its divisors is an integer number (128622661).

Almost surely, 2^257245321 is an apocalyptic number.

It is an amenable number.

257245321 is a deficient number, since it is larger than the sum of its proper divisors (1).

257245321 is an equidigital number, since it uses as much as digits as its factorization.

257245321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 31.

The square root of 257245321 is about 16038.8690686095. The cubic root of 257245321 is about 635.9883515462.

The spelling of 257245321 in words is "two hundred fifty-seven million, two hundred forty-five thousand, three hundred twenty-one".