22091609 has 4 divisors (see below), whose sum is σ = 22108800. Its totient is φ = 22074420.

The previous prime is 22091603. The next prime is 22091611. The reversal of 22091609 is 90619022.

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 22091609 - 2⁸ = 22091353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22091603) 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, 6497 + ... + 9294.

It is an arithmetic number, because the mean of its divisors is an integer number (5527200).

Almost surely, 2^22091609 is an apocalyptic number.

It is an amenable number.

22091609 is a deficient number, since it is larger than the sum of its proper divisors (17191).

22091609 is a wasteful number, since it uses less digits than its factorization.

22091609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17190.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 22091609 is about 4700.1711670959. The cubic root of 22091609 is about 280.5923217785.

The spelling of 22091609 in words is "twenty-two million, ninety-one thousand, six hundred nine".