256279019 has 4 divisors (see below), whose sum is σ = 256389480. Its totient is φ = 256168560.

The previous prime is 256279013. The next prime is 256279033. The reversal of 256279019 is 910972652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256279019 - 2²⁴ = 239501803 is a prime.

It is a super-2 number, since 2×256279019² = 131357871159204722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256279013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51674 + ... + 56415.

It is an arithmetic number, because the mean of its divisors is an integer number (64097370).

Almost surely, 2^256279019 is an apocalyptic number.

256279019 is a deficient number, since it is larger than the sum of its proper divisors (110461).

256279019 is a wasteful number, since it uses less digits than its factorization.

256279019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110460.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 256279019 is about 16008.7169692015. The cubic root of 256279019 is about 635.1910219528.

The spelling of 256279019 in words is "two hundred fifty-six million, two hundred seventy-nine thousand, nineteen".