256385719 has 2 divisors, whose sum is σ = 256385720. Its totient is φ = 256385718.

The previous prime is 256385671. The next prime is 256385747. The reversal of 256385719 is 917583652.

256385719 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 a de Polignac number, because none of the positive numbers 2^k-256385719 is a prime.

It is a super-2 number, since 2×256385719² = 131467273814293922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256385749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128192859 + 128192860.

It is an arithmetic number, because the mean of its divisors is an integer number (128192860).

Almost surely, 2^256385719 is an apocalyptic number.

256385719 is a deficient number, since it is larger than the sum of its proper divisors (1).

256385719 is an equidigital number, since it uses as much as digits as its factorization.

256385719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 46.

The square root of 256385719 is about 16012.0491817881. The cubic root of 256385719 is about 635.2791621871.

The spelling of 256385719 in words is "two hundred fifty-six million, three hundred eighty-five thousand, seven hundred nineteen".