256616519 has 2 divisors, whose sum is σ = 256616520. Its totient is φ = 256616518.

The previous prime is 256616483. The next prime is 256616531. The reversal of 256616519 is 915616652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256616519 is a prime.

It is a super-2 number, since 2×256616519² = 131704075647354722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256636519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128308259 + 128308260.

It is an arithmetic number, because the mean of its divisors is an integer number (128308260).

Almost surely, 2^256616519 is an apocalyptic number.

256616519 is a deficient number, since it is larger than the sum of its proper divisors (1).

256616519 is an equidigital number, since it uses as much as digits as its factorization.

256616519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 41.

The square root of 256616519 is about 16019.2546330970. The cubic root of 256616519 is about 635.4697324165.

The spelling of 256616519 in words is "two hundred fifty-six million, six hundred sixteen thousand, five hundred nineteen".