256261213 has 12 divisors (see below), whose sum is σ = 293166580. Its totient is φ = 222630912.

The previous prime is 256261199. The next prime is 256261217. The reversal of 256261213 is 312162652.

It can be written as a sum of positive squares in 6 ways, for example, as 1954404 + 254306809 = 1398^2 + 15947^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256261213 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 (256261217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30348 + ... + 37861.

Almost surely, 2^256261213 is an apocalyptic number.

It is an amenable number.

256261213 is a deficient number, since it is larger than the sum of its proper divisors (36905367).

256261213 is a wasteful number, since it uses less digits than its factorization.

256261213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68256 (or 68239 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 256261213 is about 16008.1608250292. The cubic root of 256261213 is about 635.1763108080.

The spelling of 256261213 in words is "two hundred fifty-six million, two hundred sixty-one thousand, two hundred thirteen".