22490681 has 2 divisors, whose sum is σ = 22490682. Its totient is φ = 22490680.

The previous prime is 22490669. The next prime is 22490683. The reversal of 22490681 is 18609422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15335056 + 7155625 = 3916^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 22490681 - 2¹⁴ = 22474297 is a prime.

It is a super-2 number, since 2×22490681² = 1011661463687522, which contains 22 as substring.

Together with 22490683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22490683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11245340 + 11245341.

It is an arithmetic number, because the mean of its divisors is an integer number (11245341).

Almost surely, 2^22490681 is an apocalyptic number.

It is an amenable number.

22490681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22490681 is an equidigital number, since it uses as much as digits as its factorization.

22490681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 22490681 is about 4742.4340796684. The cubic root of 22490681 is about 282.2718276610.

The spelling of 22490681 in words is "twenty-two million, four hundred ninety thousand, six hundred eighty-one".