22685581 has 2 divisors, whose sum is σ = 22685582. Its totient is φ = 22685580.

The previous prime is 22685557. The next prime is 22685603. The reversal of 22685581 is 18558622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15476356 + 7209225 = 3934^2 + 2685^2 .

It is a cyclic number.

It is not a de Polignac number, because 22685581 - 2⁵ = 22685549 is a prime.

It is a super-2 number, since 2×22685581² = 1029271170615122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22685581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22685501) 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 as a sum of consecutive naturals, namely, 11342790 + 11342791.

It is an arithmetic number, because the mean of its divisors is an integer number (11342791).

Almost surely, 2^22685581 is an apocalyptic number.

It is an amenable number.

22685581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22685581 is an equidigital number, since it uses as much as digits as its factorization.

22685581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 37.

The square root of 22685581 is about 4762.9382737970. The cubic root of 22685581 is about 283.0848551247.

The spelling of 22685581 in words is "twenty-two million, six hundred eighty-five thousand, five hundred eighty-one".