9220991 has 4 divisors (see below), whose sum is σ = 9930312. Its totient is φ = 8511672.

The previous prime is 9220969. The next prime is 9221011. The reversal of 9220991 is 1990229.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9220991 - 2²² = 5026687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9220951) 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, 354641 + ... + 354666.

It is an arithmetic number, because the mean of its divisors is an integer number (2482578).

Almost surely, 2^9220991 is an apocalyptic number.

9220991 is a deficient number, since it is larger than the sum of its proper divisors (709321).

9220991 is a wasteful number, since it uses less digits than its factorization.

9220991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709320.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 9220991 is about 3036.6084699875. The cubic root of 9220991 is about 209.6971522769.

The spelling of 9220991 in words is "nine million, two hundred twenty thousand, nine hundred ninety-one".