921304609 has 9 divisors (see below), whose sum is σ = 932517777. Its totient is φ = 910225764.

The previous prime is 921304589. The next prime is 921304633. The reversal of 921304609 is 906403129.

The square root of 921304609 is 30353.

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

It is not a de Polignac number, because 921304609 - 2⁵ = 921304577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921304639) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3854712 + ... + 3854950.

Almost surely, 2^921304609 is an apocalyptic number.

921304609 is the 30353-rd square number.

921304609 is the 15177-th centered octagonal number.

It is an amenable number.

921304609 is a deficient number, since it is larger than the sum of its proper divisors (11213168).

921304609 is an frugal number, since it uses more digits than its factorization.

921304609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The cubic root of 921304609 is about 973.0483366693.

Multiplying 921304609 by its product of nonzero digits (11664), we get a square (10746096959376 = 3278124²).

The spelling of 921304609 in words is "nine hundred twenty-one million, three hundred four thousand, six hundred nine".