22590991809 has 9 divisors (see below), whose sum is σ = 32632083939. Its totient is φ = 15060360600.

The previous prime is 22590991771. The next prime is 22590991823. The reversal of 22590991809 is 90819909522.

The square root of 22590991809 is 150303.

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

It can be written as a sum of positive squares in only one way, i.e., 3030172209 + 19560819600 = 55047^2 + 139860^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 22590991809 - 2⁷ = 22590991681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22590991889) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 425859 + ... + 475959.

Almost surely, 2^22590991809 is an apocalyptic number.

22590991809 is the 150303-rd square number.

22590991809 is the 75152-nd centered octagonal number.

It is an amenable number.

22590991809 is a deficient number, since it is larger than the sum of its proper divisors (10041092130).

22590991809 is an frugal number, since it uses more digits than its factorization.

22590991809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100208 (or 50104 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The spelling of 22590991809 in words is "twenty-two billion, five hundred ninety million, nine hundred ninety-one thousand, eight hundred nine".