22118309 has 4 divisors (see below), whose sum is σ = 23419404. Its totient is φ = 20817216.

The previous prime is 22118273. The next prime is 22118339. The reversal of 22118309 is 90381122.

22118309 = 790² + 791² + ... + 823².

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

It can be written as a sum of positive squares in 2 ways, for example, as 17181025 + 4937284 = 4145^2 + 2222^2 .

It is a cyclic number.

It is not a de Polignac number, because 22118309 - 2⁸ = 22118053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22118339) 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, 650522 + ... + 650555.

It is an arithmetic number, because the mean of its divisors is an integer number (5854851).

Almost surely, 2^22118309 is an apocalyptic number.

It is an amenable number.

22118309 is a deficient number, since it is larger than the sum of its proper divisors (1301095).

22118309 is a wasteful number, since it uses less digits than its factorization.

22118309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301094.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 22118309 is about 4703.0106314998. The cubic root of 22118309 is about 280.7053179061.

The spelling of 22118309 in words is "twenty-two million, one hundred eighteen thousand, three hundred nine".