22408681 has 2 divisors, whose sum is σ = 22408682. Its totient is φ = 22408680.

The previous prime is 22408663. The next prime is 22408709. The reversal of 22408681 is 18680422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17305600 + 5103081 = 4160^2 + 2259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22408681 is a prime.

It is a super-2 number, since 2×22408681² = 1004297968319522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22408481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11204340 + 11204341.

It is an arithmetic number, because the mean of its divisors is an integer number (11204341).

Almost surely, 2^22408681 is an apocalyptic number.

It is an amenable number.

22408681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22408681 is an equidigital number, since it uses as much as digits as its factorization.

22408681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 22408681 is about 4733.7808356535. The cubic root of 22408681 is about 281.9283598177.

The spelling of 22408681 in words is "twenty-two million, four hundred eight thousand, six hundred eighty-one".