256913293 has 24 divisors (see below), whose sum is σ = 322080000. Its totient is φ = 200625984.

The previous prime is 256913201. The next prime is 256913359. The reversal of 256913293 is 392319652.

It is not a de Polignac number, because 256913293 - 2²¹ = 254816141 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 (256913593) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92083 + ... + 94831.

It is an arithmetic number, because the mean of its divisors is an integer number (13420000).

Almost surely, 2^256913293 is an apocalyptic number.

It is an amenable number.

256913293 is a deficient number, since it is larger than the sum of its proper divisors (65166707).

256913293 is a wasteful number, since it uses less digits than its factorization.

256913293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861 (or 2848 counting only the distinct ones).

The product of its digits is 87480, while the sum is 40.

The square root of 256913293 is about 16028.5149967176. The cubic root of 256913293 is about 635.7146091437.

The spelling of 256913293 in words is "two hundred fifty-six million, nine hundred thirteen thousand, two hundred ninety-three".