256624213 has 4 divisors (see below), whose sum is σ = 256869900. Its totient is φ = 256378528.

The previous prime is 256624211. The next prime is 256624253. The reversal of 256624213 is 312426652.

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 123498769 + 133125444 = 11113^2 + 11538^2 .

It is a cyclic number.

It is not a de Polignac number, because 256624213 - 2¹ = 256624211 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 (256624211) 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, 121270 + ... + 123367.

It is an arithmetic number, because the mean of its divisors is an integer number (64217475).

Almost surely, 2^256624213 is an apocalyptic number.

It is an amenable number.

256624213 is a deficient number, since it is larger than the sum of its proper divisors (245687).

256624213 is a wasteful number, since it uses less digits than its factorization.

256624213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245686.

The product of its digits is 17280, while the sum is 31.

The square root of 256624213 is about 16019.4947797988. The cubic root of 256624213 is about 635.4760833395.

The spelling of 256624213 in words is "two hundred fifty-six million, six hundred twenty-four thousand, two hundred thirteen".