255959391 has 4 divisors (see below), whose sum is σ = 341279192. Its totient is φ = 170639592.

The previous prime is 255959383. The next prime is 255959401. The reversal of 255959391 is 193959552.

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

It is not a de Polignac number, because 255959391 - 2³ = 255959383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255959391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255959371) 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, 42659896 + ... + 42659901.

It is an arithmetic number, because the mean of its divisors is an integer number (85319798).

Almost surely, 2^255959391 is an apocalyptic number.

255959391 is a deficient number, since it is larger than the sum of its proper divisors (85319801).

255959391 is an equidigital number, since it uses as much as digits as its factorization.

255959391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85319800.

The product of its digits is 546750, while the sum is 48.

The square root of 255959391 is about 15998.7309184197. The cubic root of 255959391 is about 634.9268446528.

The spelling of 255959391 in words is "two hundred fifty-five million, nine hundred fifty-nine thousand, three hundred ninety-one".