256430051 has 2 divisors, whose sum is σ = 256430052. Its totient is φ = 256430050.

The previous prime is 256430033. The next prime is 256430089. The reversal of 256430051 is 150034652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256430051 - 2¹⁴ = 256413667 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256430051.

It is not a weakly prime, because it can be changed into another prime (256435051) 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, 128215025 + 128215026.

It is an arithmetic number, because the mean of its divisors is an integer number (128215026).

Almost surely, 2^256430051 is an apocalyptic number.

256430051 is a deficient number, since it is larger than the sum of its proper divisors (1).

256430051 is an equidigital number, since it uses as much as digits as its factorization.

256430051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 256430051 is about 16013.4334544469. The cubic root of 256430051 is about 635.3157757354.

The spelling of 256430051 in words is "two hundred fifty-six million, four hundred thirty thousand, fifty-one".