256947313 has 16 divisors (see below), whose sum is σ = 303805440. Its totient is φ = 212659200.

The previous prime is 256947293. The next prime is 256947319. The reversal of 256947313 is 313749652.

It is a happy number.

256947313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 256947313 - 2⁵ = 256947281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256947319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122433 + ... + 124513.

It is an arithmetic number, because the mean of its divisors is an integer number (18987840).

Almost surely, 2^256947313 is an apocalyptic number.

It is an amenable number.

256947313 is a deficient number, since it is larger than the sum of its proper divisors (46858127).

256947313 is a wasteful number, since it uses less digits than its factorization.

256947313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688.

The product of its digits is 136080, while the sum is 40.

The square root of 256947313 is about 16029.5761952710. The cubic root of 256947313 is about 635.7426679701.

The spelling of 256947313 in words is "two hundred fifty-six million, nine hundred forty-seven thousand, three hundred thirteen".