256308419 has 2 divisors, whose sum is σ = 256308420. Its totient is φ = 256308418.

The previous prime is 256308379. The next prime is 256308497. The reversal of 256308419 is 914803652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256308419 - 2²⁰ = 255259843 is a prime.

It is a super-2 number, since 2×256308419² = 131388011300559122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256308919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128154209 + 128154210.

It is an arithmetic number, because the mean of its divisors is an integer number (128154210).

Almost surely, 2^256308419 is an apocalyptic number.

256308419 is a deficient number, since it is larger than the sum of its proper divisors (1).

256308419 is an equidigital number, since it uses as much as digits as its factorization.

256308419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 256308419 is about 16009.6351925957. The cubic root of 256308419 is about 635.2153104569.

The spelling of 256308419 in words is "two hundred fifty-six million, three hundred eight thousand, four hundred nineteen".