316921 has 8 divisors (see below), whose sum is σ = 353664. Its totient is φ = 281520.

The previous prime is 316919. The next prime is 316937. The reversal of 316921 is 129613.

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 316921 - 2¹ = 316919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 316892 and 316901.

It is not an unprimeable number, because it can be changed into a prime (316951) 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, 211 + ... + 823.

It is an arithmetic number, because the mean of its divisors is an integer number (44208).

2³¹⁶⁹²¹ is an apocalyptic number.

It is an amenable number.

316921 is a deficient number, since it is larger than the sum of its proper divisors (36743).

316921 is a wasteful number, since it uses less digits than its factorization.

316921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its digits is 324, while the sum is 22.

The square root of 316921 is about 562.9573696116. The cubic root of 316921 is about 68.1789548158.

The spelling of 316921 in words is "three hundred sixteen thousand, nine hundred twenty-one".