256415899 has 2 divisors, whose sum is σ = 256415900. Its totient is φ = 256415898.

The previous prime is 256415893. The next prime is 256415903. The reversal of 256415899 is 998514652.

256415899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256415899 - 2⁷ = 256415771 is a prime.

It is a super-2 number, since 2×256415899² = 131498226519956402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256415893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128207949 + 128207950.

It is an arithmetic number, because the mean of its divisors is an integer number (128207950).

Almost surely, 2^256415899 is an apocalyptic number.

256415899 is a deficient number, since it is larger than the sum of its proper divisors (1).

256415899 is an equidigital number, since it uses as much as digits as its factorization.

256415899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 49.

The square root of 256415899 is about 16012.9915693477. The cubic root of 256415899 is about 635.3040881371.

The spelling of 256415899 in words is "two hundred fifty-six million, four hundred fifteen thousand, eight hundred ninety-nine".