22485902209 has 3 divisors (see below), whose sum is σ = 22486052163. Its totient is φ = 22485752256.

The previous prime is 22485902191. The next prime is 22485902213. The reversal of 22485902209 is 90220958422.

The square root of 22485902209 is 149953.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2114620225 + 20371281984 = 45985^2 + 142728^2 .

It is not a de Polignac number, because 22485902209 - 2⁵ = 22485902177 is a prime.

It is a super-2 number, since 2×22485902209² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22485902269) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 74977 + ... + 224929.

It is an arithmetic number, because the mean of its divisors is an integer number (7495350721).

Almost surely, 2^22485902209 is an apocalyptic number.

22485902209 is the 149953-rd square number.

22485902209 is the 74977-th centered octagonal number.

It is an amenable number.

22485902209 is a deficient number, since it is larger than the sum of its proper divisors (149954).

22485902209 is an frugal number, since it uses more digits than its factorization.

22485902209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299906 (or 149953 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 22485902209 in words is "twenty-two billion, four hundred eighty-five million, nine hundred two thousand, two hundred nine".