256345519 has 2 divisors, whose sum is σ = 256345520. Its totient is φ = 256345518.

The previous prime is 256345517. The next prime is 256345553. The reversal of 256345519 is 915543652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256345519 - 2¹ = 256345517 is a prime.

It is a super-2 number, since 2×256345519² = 131426050222758722, which contains 22 as substring.

Together with 256345517, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256345513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128172759 + 128172760.

It is an arithmetic number, because the mean of its divisors is an integer number (128172760).

Almost surely, 2^256345519 is an apocalyptic number.

256345519 is a deficient number, since it is larger than the sum of its proper divisors (1).

256345519 is an equidigital number, since it uses as much as digits as its factorization.

256345519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 40.

The square root of 256345519 is about 16010.7938279150. The cubic root of 256345519 is about 635.2459575852.

The spelling of 256345519 in words is "two hundred fifty-six million, three hundred forty-five thousand, five hundred nineteen".