22942181 has 2 divisors, whose sum is σ = 22942182. Its totient is φ = 22942180.

The previous prime is 22942151. The next prime is 22942189. The reversal of 22942181 is 18124922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 4879681 = 4250^2 + 2209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22942181 is a prime.

It is a super-2 number, since 2×22942181² = 1052687338073522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22942189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11471090 + 11471091.

It is an arithmetic number, because the mean of its divisors is an integer number (11471091).

Almost surely, 2^22942181 is an apocalyptic number.

It is an amenable number.

22942181 is a deficient number, since it is larger than the sum of its proper divisors (1).

22942181 is an equidigital number, since it uses as much as digits as its factorization.

22942181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 22942181 is about 4789.7996826590. The cubic root of 22942181 is about 284.1481943294.

The spelling of 22942181 in words is "twenty-two million, nine hundred forty-two thousand, one hundred eighty-one".