256260909 has 4 divisors (see below), whose sum is σ = 341681216. Its totient is φ = 170840604.

The previous prime is 256260899. The next prime is 256260929. The reversal of 256260909 is 909062652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 256260909 - 2⁵ = 256260877 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 (256260929) 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, 42710149 + ... + 42710154.

It is an arithmetic number, because the mean of its divisors is an integer number (85420304).

Almost surely, 2^256260909 is an apocalyptic number.

It is an amenable number.

256260909 is a deficient number, since it is larger than the sum of its proper divisors (85420307).

256260909 is an equidigital number, since it uses as much as digits as its factorization.

256260909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85420306.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 256260909 is about 16008.1513298694. The cubic root of 256260909 is about 635.1760596402.

The spelling of 256260909 in words is "two hundred fifty-six million, two hundred sixty thousand, nine hundred nine".