256617213 has 8 divisors (see below), whose sum is σ = 344618400. Its totient is φ = 169847088.

The previous prime is 256617203. The next prime is 256617223. The reversal of 256617213 is 312716652.

It is an interprime number because it is at equal distance from previous prime (256617203) and next prime (256617223).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256617213 - 2⁴ = 256617197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256617203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307278 + ... + 308111.

It is an arithmetic number, because the mean of its divisors is an integer number (43077300).

Almost surely, 2^256617213 is an apocalyptic number.

It is an amenable number.

256617213 is a deficient number, since it is larger than the sum of its proper divisors (88001187).

256617213 is a wasteful number, since it uses less digits than its factorization.

256617213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615531.

The product of its digits is 15120, while the sum is 33.

The square root of 256617213 is about 16019.2762945147. The cubic root of 256617213 is about 635.4703052759.

The spelling of 256617213 in words is "two hundred fifty-six million, six hundred seventeen thousand, two hundred thirteen".