256798097 has 2 divisors, whose sum is σ = 256798098. Its totient is φ = 256798096.

The previous prime is 256798067. The next prime is 256798109. The reversal of 256798097 is 790897652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246615616 + 10182481 = 15704^2 + 3191^2 .

It is a cyclic number.

It is not a de Polignac number, because 256798097 - 2²⁶ = 189689233 is a prime.

It is not a weakly prime, because it can be changed into another prime (256798007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128399048 + 128399049.

It is an arithmetic number, because the mean of its divisors is an integer number (128399049).

Almost surely, 2^256798097 is an apocalyptic number.

It is an amenable number.

256798097 is a deficient number, since it is larger than the sum of its proper divisors (1).

256798097 is an equidigital number, since it uses as much as digits as its factorization.

256798097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 256798097 is about 16024.9211230508. The cubic root of 256798097 is about 635.6195800292.

The spelling of 256798097 in words is "two hundred fifty-six million, seven hundred ninety-eight thousand, ninety-seven".