257698289 has 2 divisors, whose sum is σ = 257698290. Its totient is φ = 257698288.

The previous prime is 257698277. The next prime is 257698339. The reversal of 257698289 is 982896752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245392225 + 12306064 = 15665^2 + 3508^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257698289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257698589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128849144 + 128849145.

It is an arithmetic number, because the mean of its divisors is an integer number (128849145).

Almost surely, 2^257698289 is an apocalyptic number.

It is an amenable number.

257698289 is a deficient number, since it is larger than the sum of its proper divisors (1).

257698289 is an equidigital number, since it uses as much as digits as its factorization.

257698289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The square root of 257698289 is about 16052.9838036422. The cubic root of 257698289 is about 636.3614240238.

The spelling of 257698289 in words is "two hundred fifty-seven million, six hundred ninety-eight thousand, two hundred eighty-nine".