22781189 has 2 divisors, whose sum is σ = 22781190. Its totient is φ = 22781188.

The previous prime is 22781177. The next prime is 22781191. The reversal of 22781189 is 98118722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15864289 + 6916900 = 3983^2 + 2630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22781189 is a prime.

Together with 22781191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22781089) 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, 11390594 + 11390595.

It is an arithmetic number, because the mean of its divisors is an integer number (11390595).

Almost surely, 2^22781189 is an apocalyptic number.

It is an amenable number.

22781189 is a deficient number, since it is larger than the sum of its proper divisors (1).

22781189 is an equidigital number, since it uses as much as digits as its factorization.

22781189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 38.

The square root of 22781189 is about 4772.9643828547. The cubic root of 22781189 is about 283.4819832049.

The spelling of 22781189 in words is "twenty-two million, seven hundred eighty-one thousand, one hundred eighty-nine".