22025231281 has 27 divisors (see below), whose sum is σ = 23790581451. Its totient is φ = 20387834784.

The previous prime is 22025231269. The next prime is 22025231299. The reversal of 22025231281 is 18213252022.

The square root of 22025231281 is 148409.

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., 12502594225 + 9522637056 = 111815^2 + 97584^2 .

It is not a de Polignac number, because 22025231281 - 2²⁷ = 21891013553 is a prime.

It is a super-2 number, since 2×22025231281² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22025231231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 205843230 + ... + 205843336.

Almost surely, 2^22025231281 is an apocalyptic number.

22025231281 is the 148409-th square number.

22025231281 is the 74205-th centered octagonal number.

It is an amenable number.

22025231281 is a deficient number, since it is larger than the sum of its proper divisors (1765350170).

22025231281 is an frugal number, since it uses more digits than its factorization.

22025231281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 22025231281 in words is "twenty-two billion, twenty-five million, two hundred thirty-one thousand, two hundred eighty-one".