256813093 has 4 divisors (see below), whose sum is σ = 259306528. Its totient is φ = 254319660.

The previous prime is 256813091. The next prime is 256813103. The reversal of 256813093 is 390318652.

256813093 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256813093 - 2¹ = 256813091 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 (256813091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1246563 + ... + 1246768.

It is an arithmetic number, because the mean of its divisors is an integer number (64826632).

Almost surely, 2^256813093 is an apocalyptic number.

It is an amenable number.

256813093 is a deficient number, since it is larger than the sum of its proper divisors (2493435).

256813093 is a wasteful number, since it uses less digits than its factorization.

256813093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493434.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 256813093 is about 16025.3890124390. The cubic root of 256813093 is about 635.6319523505.

The spelling of 256813093 in words is "two hundred fifty-six million, eight hundred thirteen thousand, ninety-three".