22390681 has 2 divisors, whose sum is σ = 22390682. Its totient is φ = 22390680.

The previous prime is 22390679. The next prime is 22390699. The reversal of 22390681 is 18609322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 10830681 = 3400^2 + 3291^2 .

It is a cyclic number.

It is not a de Polignac number, because 22390681 - 2¹ = 22390679 is a prime.

It is a super-2 number, since 2×22390681² = 1002685191287522, which contains 22 as substring.

Together with 22390679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22390981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11195340 + 11195341.

It is an arithmetic number, because the mean of its divisors is an integer number (11195341).

Almost surely, 2^22390681 is an apocalyptic number.

It is an amenable number.

22390681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22390681 is an equidigital number, since it uses as much as digits as its factorization.

22390681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 22390681 is about 4731.8792250014. The cubic root of 22390681 is about 281.8528523264.

The spelling of 22390681 in words is "twenty-two million, three hundred ninety thousand, six hundred eighty-one".