22019989 has 2 divisors, whose sum is σ = 22019990. Its totient is φ = 22019988.

The previous prime is 22019969. The next prime is 22020023. The reversal of 22019989 is 98991022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19873764 + 2146225 = 4458^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 22019989 - 2⁷ = 22019861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22019909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11009994 + 11009995.

It is an arithmetic number, because the mean of its divisors is an integer number (11009995).

Almost surely, 2^22019989 is an apocalyptic number.

It is an amenable number.

22019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

22019989 is an equidigital number, since it uses as much as digits as its factorization.

22019989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 22019989 is about 4692.5461105886. The cubic root of 22019989 is about 280.2887709585.

The spelling of 22019989 in words is "twenty-two million, nineteen thousand, nine hundred eighty-nine".