22591649 has 4 divisors (see below), whose sum is σ = 22769664. Its totient is φ = 22413636.

The previous prime is 22591633. The next prime is 22591651. The reversal of 22591649 is 94619522.

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 22591649 - 2⁴ = 22591633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22591669) 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, 88817 + ... + 89070.

It is an arithmetic number, because the mean of its divisors is an integer number (5692416).

Almost surely, 2^22591649 is an apocalyptic number.

It is an amenable number.

22591649 is a deficient number, since it is larger than the sum of its proper divisors (178015).

22591649 is a wasteful number, since it uses less digits than its factorization.

22591649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178014.

The product of its digits is 38880, while the sum is 38.

The square root of 22591649 is about 4753.0673254226. The cubic root of 22591649 is about 282.6936005532.

The spelling of 22591649 in words is "twenty-two million, five hundred ninety-one thousand, six hundred forty-nine".