9921317 has 4 divisors (see below), whose sum is σ = 11338656. Its totient is φ = 8503980.

The previous prime is 9921311. The next prime is 9921323. The reversal of 9921317 is 7131299.

It is a happy number.

9921317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (9921311) and next prime (9921323).

It is a cyclic number.

It is not a de Polignac number, because 9921317 - 2¹⁰ = 9920293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 708659 + ... + 708672.

It is an arithmetic number, because the mean of its divisors is an integer number (2834664).

Almost surely, 2^9921317 is an apocalyptic number.

It is an amenable number.

9921317 is a deficient number, since it is larger than the sum of its proper divisors (1417339).

9921317 is a wasteful number, since it uses less digits than its factorization.

9921317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417338.

The product of its digits is 3402, while the sum is 32.

The square root of 9921317 is about 3149.8122166250. The cubic root of 9921317 is about 214.8769225265.

Subtracting from 9921317 its sum of digits (32), we obtain a triangular number (9921285 = T₄₄₅₄).

The spelling of 9921317 in words is "nine million, nine hundred twenty-one thousand, three hundred seventeen".