317440721 has 8 divisors (see below), whose sum is σ = 345979200. Its totient is φ = 289490832.

The previous prime is 317440693. The next prime is 317440759. The reversal of 317440721 is 127044713.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317440721 is a prime.

It is a super-2 number, since 2×317440721² = 201537222697999682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (317440421) 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, 146021 + ... + 148178.

It is an arithmetic number, because the mean of its divisors is an integer number (43247400).

Almost surely, 2^317440721 is an apocalyptic number.

It is an amenable number.

317440721 is a deficient number, since it is larger than the sum of its proper divisors (28538479).

317440721 is a wasteful number, since it uses less digits than its factorization.

317440721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294295.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 317440721 is about 17816.8661947044. The cubic root of 317440721 is about 682.1620351256.

The spelling of 317440721 in words is "three hundred seventeen million, four hundred forty thousand, seven hundred twenty-one".