256123459 has 2 divisors, whose sum is σ = 256123460. Its totient is φ = 256123458.

The previous prime is 256123453. The next prime is 256123463. The reversal of 256123459 is 954321652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256123459 - 2¹⁵ = 256090691 is a prime.

It is not a weakly prime, because it can be changed into another prime (256123453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128061729 + 128061730.

It is an arithmetic number, because the mean of its divisors is an integer number (128061730).

Almost surely, 2^256123459 is an apocalyptic number.

256123459 is a deficient number, since it is larger than the sum of its proper divisors (1).

256123459 is an equidigital number, since it uses as much as digits as its factorization.

256123459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

The square root of 256123459 is about 16003.8576287094. The cubic root of 256123459 is about 635.0624767511.

The spelling of 256123459 in words is "two hundred fifty-six million, one hundred twenty-three thousand, four hundred fifty-nine".