22785509 has 2 divisors, whose sum is σ = 22785510. Its totient is φ = 22785508.

The previous prime is 22785493. The next prime is 22785517. The reversal of 22785509 is 90558722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13653025 + 9132484 = 3695^2 + 3022^2 .

It is a cyclic number.

It is not a de Polignac number, because 22785509 - 2⁴ = 22785493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22785569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11392754 + 11392755.

It is an arithmetic number, because the mean of its divisors is an integer number (11392755).

Almost surely, 2^22785509 is an apocalyptic number.

It is an amenable number.

22785509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22785509 is an equidigital number, since it uses as much as digits as its factorization.

22785509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 22785509 is about 4773.4169103484. The cubic root of 22785509 is about 283.4999009815.

The spelling of 22785509 in words is "twenty-two million, seven hundred eighty-five thousand, five hundred nine".