256479919 has 2 divisors, whose sum is σ = 256479920. Its totient is φ = 256479918.

The previous prime is 256479871. The next prime is 256479947. The reversal of 256479919 is 919974652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256479919 - 2⁹ = 256479407 is a prime.

It is a super-2 number, since 2×256479919² = 131563897700493122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256479019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128239959 + 128239960.

It is an arithmetic number, because the mean of its divisors is an integer number (128239960).

Almost surely, 2^256479919 is an apocalyptic number.

256479919 is a deficient number, since it is larger than the sum of its proper divisors (1).

256479919 is an equidigital number, since it uses as much as digits as its factorization.

256479919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 52.

The square root of 256479919 is about 16014.9904464536. The cubic root of 256479919 is about 635.3569563920.

The spelling of 256479919 in words is "two hundred fifty-six million, four hundred seventy-nine thousand, nine hundred nineteen".