256347213 has 16 divisors (see below), whose sum is σ = 357146496. Its totient is φ = 163243520.

The previous prime is 256347187. The next prime is 256347229. The reversal of 256347213 is 312743652.

It is a cyclic number.

It is not a de Polignac number, because 256347213 - 2¹⁷ = 256216141 is a prime.

It is a super-2 number, since 2×256347213² = 131427787225734738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256347613) 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, 58681 + ... + 62897.

It is an arithmetic number, because the mean of its divisors is an integer number (22321656).

Almost surely, 2^256347213 is an apocalyptic number.

256347213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256347213 is a deficient number, since it is larger than the sum of its proper divisors (100799283).

256347213 is a wasteful number, since it uses less digits than its factorization.

256347213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124.

The product of its digits is 30240, while the sum is 33.

The square root of 256347213 is about 16010.8467296393. The cubic root of 256347213 is about 635.2473568741.

The spelling of 256347213 in words is "two hundred fifty-six million, three hundred forty-seven thousand, two hundred thirteen".