9227715721 has 9 divisors (see below), whose sum is σ = 10735063821. Its totient is φ = 7908894252.

The previous prime is 9227715703. The next prime is 9227715737. The reversal of 9227715721 is 1275177229.

The square root of 9227715721 is 96061.

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

It is not a de Polignac number, because 9227715721 - 2⁵ = 9227715689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9227715121) 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, 665566 + ... + 679288.

It is an arithmetic number, because the mean of its divisors is an integer number (1192784869).

Almost surely, 2^9227715721 is an apocalyptic number.

9227715721 is the 96061-st square number.

9227715721 is the 48031-st centered octagonal number.

It is an amenable number.

9227715721 is a deficient number, since it is larger than the sum of its proper divisors (1507348100).

9227715721 is an frugal number, since it uses more digits than its factorization.

9227715721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27460 (or 13730 counting only the distinct ones).

The product of its digits is 123480, while the sum is 43.

The cubic root of 9227715721 is about 2097.4811614763.

The spelling of 9227715721 in words is "nine billion, two hundred twenty-seven million, seven hundred fifteen thousand, seven hundred twenty-one".