256026457 has 2 divisors, whose sum is σ = 256026458. Its totient is φ = 256026456.

The previous prime is 256026451. The next prime is 256026461. The reversal of 256026457 is 754620652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255232576 + 793881 = 15976^2 + 891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256026457 is a prime.

It is not a weakly prime, because it can be changed into another prime (256026451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128013228 + 128013229.

It is an arithmetic number, because the mean of its divisors is an integer number (128013229).

Almost surely, 2^256026457 is an apocalyptic number.

It is an amenable number.

256026457 is a deficient number, since it is larger than the sum of its proper divisors (1).

256026457 is an equidigital number, since it uses as much as digits as its factorization.

256026457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 256026457 is about 16000.8267598896. The cubic root of 256026457 is about 634.9822939242.

The spelling of 256026457 in words is "two hundred fifty-six million, twenty-six thousand, four hundred fifty-seven".