256001599 has 4 divisors (see below), whose sum is σ = 292573264. Its totient is φ = 219429936.

The previous prime is 256001597. The next prime is 256001609. The reversal of 256001599 is 995100652.

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 256001599 - 2¹ = 256001597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256001591) 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, 18285822 + ... + 18285835.

It is an arithmetic number, because the mean of its divisors is an integer number (73143316).

Almost surely, 2^256001599 is an apocalyptic number.

256001599 is a deficient number, since it is larger than the sum of its proper divisors (36571665).

256001599 is an equidigital number, since it uses as much as digits as its factorization.

256001599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36571664.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 256001599 is about 16000.0499686720. The cubic root of 256001599 is about 634.9617427920.

The spelling of 256001599 in words is "two hundred fifty-six million, one thousand, five hundred ninety-nine".