256365613 has 32 divisors (see below), whose sum is σ = 329472000. Its totient is φ = 194394816.

The previous prime is 256365583. The next prime is 256365647. The reversal of 256365613 is 316563652.

It is not a de Polignac number, because 256365613 - 2⁵ = 256365581 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 (256365653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130563 + ... + 132511.

It is an arithmetic number, because the mean of its divisors is an integer number (10296000).

Almost surely, 2^256365613 is an apocalyptic number.

256365613 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256365613 is a deficient number, since it is larger than the sum of its proper divisors (73106387).

256365613 is a wasteful number, since it uses less digits than its factorization.

256365613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041.

The product of its digits is 97200, while the sum is 37.

The square root of 256365613 is about 16011.4213297883. The cubic root of 256365613 is about 635.2625553641.

The spelling of 256365613 in words is "two hundred fifty-six million, three hundred sixty-five thousand, six hundred thirteen".