256317017 has 8 divisors (see below), whose sum is σ = 279961920. Its totient is φ = 232729360.

The previous prime is 256316989. The next prime is 256317043. The reversal of 256317017 is 710713652.

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

It is a cyclic number.

It is not a de Polignac number, because 256317017 - 2¹⁰ = 256315993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256310017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4658 + ... + 23115.

It is an arithmetic number, because the mean of its divisors is an integer number (34995240).

Almost surely, 2^256317017 is an apocalyptic number.

It is an amenable number.

256317017 is a deficient number, since it is larger than the sum of its proper divisors (23644903).

256317017 is a wasteful number, since it uses less digits than its factorization.

256317017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28623.

The product of its (nonzero) digits is 8820, while the sum is 32.

The square root of 256317017 is about 16009.9037161377. The cubic root of 256317017 is about 635.2224132541. Note that the first 3 decimals are identical.

The spelling of 256317017 in words is "two hundred fifty-six million, three hundred seventeen thousand, seventeen".