22490981 has 2 divisors, whose sum is σ = 22490982. Its totient is φ = 22490980.

The previous prime is 22490969. The next prime is 22490989. The reversal of 22490981 is 18909422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 70756 = 4735^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 22490981 - 2⁶ = 22490917 is a prime.

It is a super-2 number, since 2×22490981² = 1011688452684722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22490989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11245490 + 11245491.

It is an arithmetic number, because the mean of its divisors is an integer number (11245491).

Almost surely, 2^22490981 is an apocalyptic number.

It is an amenable number.

22490981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22490981 is an equidigital number, since it uses as much as digits as its factorization.

22490981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 22490981 is about 4742.4657088903. The cubic root of 22490981 is about 282.2730827167.

The spelling of 22490981 in words is "twenty-two million, four hundred ninety thousand, nine hundred eighty-one".