316688721 has 8 divisors (see below), whose sum is σ = 422419200. Its totient is φ = 211042032.

The previous prime is 316688719. The next prime is 316688761. The reversal of 316688721 is 127886613.

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

It is not a de Polignac number, because 316688721 - 2¹ = 316688719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (316688711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11521 + ... + 27678.

It is an arithmetic number, because the mean of its divisors is an integer number (52802400).

Almost surely, 2^316688721 is an apocalyptic number.

It is an amenable number.

316688721 is a deficient number, since it is larger than the sum of its proper divisors (105730479).

316688721 is a wasteful number, since it uses less digits than its factorization.

316688721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41895.

The product of its digits is 96768, while the sum is 42.

The square root of 316688721 is about 17795.7500825338. The cubic root of 316688721 is about 681.6229408117.

The spelling of 316688721 in words is "three hundred sixteen million, six hundred eighty-eight thousand, seven hundred twenty-one".