22636681 has 2 divisors, whose sum is σ = 22636682. Its totient is φ = 22636680.

The previous prime is 22636661. The next prime is 22636697. The reversal of 22636681 is 18663622.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 4862025 = 4216^2 + 2205^2 .

It is a cyclic number.

It is not a de Polignac number, because 22636681 - 2¹⁵ = 22603913 is a prime.

It is a super-2 number, since 2×22636681² = 1024838653391522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22636631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11318340 + 11318341.

It is an arithmetic number, because the mean of its divisors is an integer number (11318341).

Almost surely, 2^22636681 is an apocalyptic number.

It is an amenable number.

22636681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22636681 is an equidigital number, since it uses as much as digits as its factorization.

22636681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 22636681 is about 4757.8021186258. The cubic root of 22636681 is about 282.8813072165.

The spelling of 22636681 in words is "twenty-two million, six hundred thirty-six thousand, six hundred eighty-one".