22685491 has 2 divisors, whose sum is σ = 22685492. Its totient is φ = 22685490.

The previous prime is 22685479. The next prime is 22685501. The reversal of 22685491 is 19458622.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22685491 - 2⁷ = 22685363 is a prime.

It is a super-2 number, since 2×22685491² = 1029263003822162, 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 22685491.

It is not a weakly prime, because it can be changed into another prime (22685891) 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, 11342745 + 11342746.

It is an arithmetic number, because the mean of its divisors is an integer number (11342746).

Almost surely, 2^22685491 is an apocalyptic number.

22685491 is a deficient number, since it is larger than the sum of its proper divisors (1).

22685491 is an equidigital number, since it uses as much as digits as its factorization.

22685491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 22685491 is about 4762.9288258382. The cubic root of 22685491 is about 283.0844807655.

The spelling of 22685491 in words is "twenty-two million, six hundred eighty-five thousand, four hundred ninety-one".