22056509 has 2 divisors, whose sum is σ = 22056510. Its totient is φ = 22056508.

The previous prime is 22056493. The next prime is 22056521. The reversal of 22056509 is 90565022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12924025 + 9132484 = 3595^2 + 3022^2 .

It is a cyclic number.

It is not a de Polignac number, because 22056509 - 2⁴ = 22056493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22056409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11028254 + 11028255.

It is an arithmetic number, because the mean of its divisors is an integer number (11028255).

Almost surely, 2^22056509 is an apocalyptic number.

It is an amenable number.

22056509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22056509 is an equidigital number, since it uses as much as digits as its factorization.

22056509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 22056509 is about 4696.4357762031. The cubic root of 22056509 is about 280.4436377065.

The spelling of 22056509 in words is "twenty-two million, fifty-six thousand, five hundred nine".