17313921 has 27 divisors (see below), whose sum is σ = 26761059. Its totient is φ = 10785312.

The previous prime is 17313913. The next prime is 17313929. The reversal of 17313921 is 12931371.

The square root of 17313921 is 4161.

It is a perfect power (a square), and thus also a powerful number.

17313921 is nontrivially palindromic in base 4 and base 8.

It is an interprime number because it is at equal distance from previous prime (17313913) and next prime (17313929).

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 7485696 = 3135^2 + 2736^2 .

It is not a de Polignac number, because 17313921 - 2³ = 17313913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17313929) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 237141 + ... + 237213.

Almost surely, 2^17313921 is an apocalyptic number.

17313921 is the 4161-st square number.

17313921 is the 2081-st centered octagonal number.

It is an amenable number.

17313921 is a deficient number, since it is larger than the sum of its proper divisors (9447138).

17313921 is an equidigital number, since it uses as much as digits as its factorization.

17313921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 95 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The cubic root of 17313921 is about 258.7012202382.

The spelling of 17313921 in words is "seventeen million, three hundred thirteen thousand, nine hundred twenty-one".