22125509 has 6 divisors (see below), whose sum is σ = 25737894. Its totient is φ = 18964680.

The previous prime is 22125503. The next prime is 22125511. The reversal of 22125509 is 90552122.

It can be written as a sum of positive squares in only one way, i.e., 20448484 + 1677025 = 4522^2 + 1295^2 .

It is not a de Polignac number, because 22125509 - 2²⁰ = 21076933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22125503) 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 5 ways as a sum of consecutive naturals, for example, 225722 + ... + 225819.

It is an arithmetic number, because the mean of its divisors is an integer number (4289649).

Almost surely, 2^22125509 is an apocalyptic number.

It is an amenable number.

22125509 is a deficient number, since it is larger than the sum of its proper divisors (3612385).

22125509 is an equidigital number, since it uses as much as digits as its factorization.

22125509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451555 (or 451548 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 22125509 is about 4703.7760363351. The cubic root of 22125509 is about 280.7357732033.

The spelling of 22125509 in words is "twenty-two million, one hundred twenty-five thousand, five hundred nine".