256752557 has 2 divisors, whose sum is σ = 256752558. Its totient is φ = 256752556.

The previous prime is 256752553. The next prime is 256752563. The reversal of 256752557 is 755257652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220403716 + 36348841 = 14846^2 + 6029^2 .

It is a cyclic number.

It is not a de Polignac number, because 256752557 - 2² = 256752553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256752553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128376278 + 128376279.

It is an arithmetic number, because the mean of its divisors is an integer number (128376279).

Almost surely, 2^256752557 is an apocalyptic number.

It is an amenable number.

256752557 is a deficient number, since it is larger than the sum of its proper divisors (1).

256752557 is an equidigital number, since it uses as much as digits as its factorization.

256752557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 735000, while the sum is 44.

The square root of 256752557 is about 16023.5001482198. The cubic root of 256752557 is about 635.5820046899.

The spelling of 256752557 in words is "two hundred fifty-six million, seven hundred fifty-two thousand, five hundred fifty-seven".