22161309 has 4 divisors (see below), whose sum is σ = 29548416. Its totient is φ = 14774204.

The previous prime is 22161289. The next prime is 22161313. The reversal of 22161309 is 90316122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22161309 - 2¹¹ = 22159261 is a prime.

It is a super-2 number, since 2×22161309² = 982247233186962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3693549 + ... + 3693554.

It is an arithmetic number, because the mean of its divisors is an integer number (7387104).

Almost surely, 2^22161309 is an apocalyptic number.

It is an amenable number.

22161309 is a deficient number, since it is larger than the sum of its proper divisors (7387107).

22161309 is an equidigital number, since it uses as much as digits as its factorization.

22161309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7387106.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 22161309 is about 4707.5799515250. The cubic root of 22161309 is about 280.8871056906.

The spelling of 22161309 in words is "twenty-two million, one hundred sixty-one thousand, three hundred nine".