9022721 has 4 divisors (see below), whose sum is σ = 9055572. Its totient is φ = 8989872.

The previous prime is 9022679. The next prime is 9022723. The reversal of 9022721 is 1272209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1272209 = 31 ⋅41039.

It can be written as a sum of positive squares in 2 ways, for example, as 583696 + 8439025 = 764^2 + 2905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9022721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9022723) 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, 16010 + ... + 16563.

It is an arithmetic number, because the mean of its divisors is an integer number (2263893).

Almost surely, 2^9022721 is an apocalyptic number.

It is an amenable number.

9022721 is a deficient number, since it is larger than the sum of its proper divisors (32851).

9022721 is a wasteful number, since it uses less digits than its factorization.

9022721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32850.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 9022721 is about 3003.7844463277. The cubic root of 9022721 is about 208.1832781153.

The spelling of 9022721 in words is "nine million, twenty-two thousand, seven hundred twenty-one".