256557199 has 2 divisors, whose sum is σ = 256557200. Its totient is φ = 256557198.

The previous prime is 256557181. The next prime is 256557239. The reversal of 256557199 is 991755652.

256557199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256557199 - 2⁵ = 256557167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256557109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128278599 + 128278600.

It is an arithmetic number, because the mean of its divisors is an integer number (128278600).

Almost surely, 2^256557199 is an apocalyptic number.

256557199 is a deficient number, since it is larger than the sum of its proper divisors (1).

256557199 is an equidigital number, since it uses as much as digits as its factorization.

256557199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 850500, while the sum is 49.

The square root of 256557199 is about 16017.4030042326. The cubic root of 256557199 is about 635.4207631481.

The spelling of 256557199 in words is "two hundred fifty-six million, five hundred fifty-seven thousand, one hundred ninety-nine".