257357609 has 2 divisors, whose sum is σ = 257357610. Its totient is φ = 257357608.

The previous prime is 257357593. The next prime is 257357627. The reversal of 257357609 is 906753752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254562025 + 2795584 = 15955^2 + 1672^2 .

It is a cyclic number.

It is not a de Polignac number, because 257357609 - 2⁴ = 257357593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257357609.

It is not a weakly prime, because it can be changed into another prime (257357669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128678804 + 128678805.

It is an arithmetic number, because the mean of its divisors is an integer number (128678805).

Almost surely, 2^257357609 is an apocalyptic number.

It is an amenable number.

257357609 is a deficient number, since it is larger than the sum of its proper divisors (1).

257357609 is an equidigital number, since it uses as much as digits as its factorization.

257357609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 44.

The square root of 257357609 is about 16042.3691828857. The cubic root of 257357609 is about 636.0808747345.

The spelling of 257357609 in words is "two hundred fifty-seven million, three hundred fifty-seven thousand, six hundred nine".