22172789 has 2 divisors, whose sum is σ = 22172790. Its totient is φ = 22172788.

The previous prime is 22172771. The next prime is 22172797. The reversal of 22172789 is 98727122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11662225 + 10510564 = 3415^2 + 3242^2 .

It is a cyclic number.

It is not a de Polignac number, because 22172789 - 2²⁴ = 5395573 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22172729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11086394 + 11086395.

It is an arithmetic number, because the mean of its divisors is an integer number (11086395).

Almost surely, 2^22172789 is an apocalyptic number.

It is an amenable number.

22172789 is a deficient number, since it is larger than the sum of its proper divisors (1).

22172789 is an equidigital number, since it uses as much as digits as its factorization.

22172789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 22172789 is about 4708.7991038056. The cubic root of 22172789 is about 280.9355990254.

The spelling of 22172789 in words is "twenty-two million, one hundred seventy-two thousand, seven hundred eighty-nine".