256498577 has 2 divisors, whose sum is σ = 256498578. Its totient is φ = 256498576.

The previous prime is 256498559. The next prime is 256498589. The reversal of 256498577 is 775894652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249924481 + 6574096 = 15809^2 + 2564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256498577 is a prime.

It is not a weakly prime, because it can be changed into another prime (256498477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128249288 + 128249289.

It is an arithmetic number, because the mean of its divisors is an integer number (128249289).

Almost surely, 2^256498577 is an apocalyptic number.

It is an amenable number.

256498577 is a deficient number, since it is larger than the sum of its proper divisors (1).

256498577 is an equidigital number, since it uses as much as digits as its factorization.

256498577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 53.

The square root of 256498577 is about 16015.5729525984. The cubic root of 256498577 is about 635.3723626698.

The spelling of 256498577 in words is "two hundred fifty-six million, four hundred ninety-eight thousand, five hundred seventy-seven".