256792457 has 2 divisors, whose sum is σ = 256792458. Its totient is φ = 256792456.

The previous prime is 256792453. The next prime is 256792513. The reversal of 256792457 is 754297652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235039561 + 21752896 = 15331^2 + 4664^2 .

It is a cyclic number.

It is not a de Polignac number, because 256792457 - 2² = 256792453 is a prime.

It is not a weakly prime, because it can be changed into another prime (256792451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128396228 + 128396229.

It is an arithmetic number, because the mean of its divisors is an integer number (128396229).

Almost surely, 2^256792457 is an apocalyptic number.

It is an amenable number.

256792457 is a deficient number, since it is larger than the sum of its proper divisors (1).

256792457 is an equidigital number, since it uses as much as digits as its factorization.

256792457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 47.

The square root of 256792457 is about 16024.7451461794. The cubic root of 256792457 is about 635.6149266709.

The spelling of 256792457 in words is "two hundred fifty-six million, seven hundred ninety-two thousand, four hundred fifty-seven".