256311365 has 4 divisors (see below), whose sum is σ = 307573644. Its totient is φ = 205049088.

The previous prime is 256311361. The next prime is 256311401. The reversal of 256311365 is 563113652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 119093569 + 137217796 = 10913^2 + 11714^2 .

It is a cyclic number.

It is not a de Polignac number, because 256311365 - 2² = 256311361 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 (256311361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25631132 + ... + 25631141.

It is an arithmetic number, because the mean of its divisors is an integer number (76893411).

Almost surely, 2^256311365 is an apocalyptic number.

It is an amenable number.

256311365 is a deficient number, since it is larger than the sum of its proper divisors (51262279).

256311365 is an equidigital number, since it uses as much as digits as its factorization.

256311365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51262278.

The product of its digits is 16200, while the sum is 32.

The square root of 256311365 is about 16009.7271994247. The cubic root of 256311365 is about 635.2177441617.

The spelling of 256311365 in words is "two hundred fifty-six million, three hundred eleven thousand, three hundred sixty-five".