22681581 has 16 divisors (see below), whose sum is σ = 32657856. Its totient is φ = 13919616.

The previous prime is 22681523. The next prime is 22681609. The reversal of 22681581 is 18518622.

It is not a de Polignac number, because 22681581 - 2⁶ = 22681517 is a prime.

It is a super-2 number, since 2×22681581² = 1028908233319122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22681501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21441 + ... + 22473.

It is an arithmetic number, because the mean of its divisors is an integer number (2041116).

Almost surely, 2^22681581 is an apocalyptic number.

It is an amenable number.

22681581 is a deficient number, since it is larger than the sum of its proper divisors (9976275).

22681581 is a wasteful number, since it uses less digits than its factorization.

22681581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612.

The product of its digits is 7680, while the sum is 33.

The square root of 22681581 is about 4762.5183464214. The cubic root of 22681581 is about 283.0682159803.

The spelling of 22681581 in words is "twenty-two million, six hundred eighty-one thousand, five hundred eighty-one".