22091309 has 4 divisors (see below), whose sum is σ = 22102716. Its totient is φ = 22079904.

The previous prime is 22091299. The next prime is 22091341. The reversal of 22091309 is 90319022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11055625 + 11035684 = 3325^2 + 3322^2 .

It is a cyclic number.

It is not a de Polignac number, because 22091309 - 2²⁰ = 21042733 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 (22091389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994 + ... + 6939.

It is an arithmetic number, because the mean of its divisors is an integer number (5525679).

Almost surely, 2^22091309 is an apocalyptic number.

It is an amenable number.

22091309 is a deficient number, since it is larger than the sum of its proper divisors (11407).

22091309 is an equidigital number, since it uses as much as digits as its factorization.

22091309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11406.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 22091309 is about 4700.1392532562. The cubic root of 22091309 is about 280.5910516420.

The spelling of 22091309 in words is "twenty-two million, ninety-one thousand, three hundred nine".