257622389 has 2 divisors, whose sum is σ = 257622390. Its totient is φ = 257622388.

The previous prime is 257622371. The next prime is 257622401. The reversal of 257622389 is 983226752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179158225 + 78464164 = 13385^2 + 8858^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257622389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257622889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128811194 + 128811195.

It is an arithmetic number, because the mean of its divisors is an integer number (128811195).

Almost surely, 2^257622389 is an apocalyptic number.

It is an amenable number.

257622389 is a deficient number, since it is larger than the sum of its proper divisors (1).

257622389 is an equidigital number, since it uses as much as digits as its factorization.

257622389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 257622389 is about 16050.6195830566. The cubic root of 257622389 is about 636.2989419446.

The spelling of 257622389 in words is "two hundred fifty-seven million, six hundred twenty-two thousand, three hundred eighty-nine".