22789981 has 2 divisors, whose sum is σ = 22789982. Its totient is φ = 22789980.

The previous prime is 22789967. The next prime is 22790017. The reversal of 22789981 is 18998722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21996100 + 793881 = 4690^2 + 891^2 .

It is a cyclic number.

It is not a de Polignac number, because 22789981 - 2¹³ = 22781789 is a prime.

It is a super-2 number, since 2×22789981² = 1038766467960722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22789951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11394990 + 11394991.

It is an arithmetic number, because the mean of its divisors is an integer number (11394991).

Almost surely, 2^22789981 is an apocalyptic number.

It is an amenable number.

22789981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22789981 is an equidigital number, since it uses as much as digits as its factorization.

22789981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 46.

The square root of 22789981 is about 4773.8853149191. The cubic root of 22789981 is about 283.5184468129.

The spelling of 22789981 in words is "twenty-two million, seven hundred eighty-nine thousand, nine hundred eighty-one".