22305509 has 2 divisors, whose sum is σ = 22305510. Its totient is φ = 22305508.

The previous prime is 22305473. The next prime is 22305511. The reversal of 22305509 is 90550322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13912900 + 8392609 = 3730^2 + 2897^2 .

It is a cyclic number.

It is not a de Polignac number, because 22305509 - 2¹² = 22301413 is a prime.

Together with 22305511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22305529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11152754 + 11152755.

It is an arithmetic number, because the mean of its divisors is an integer number (11152755).

Almost surely, 2^22305509 is an apocalyptic number.

It is an amenable number.

22305509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22305509 is an equidigital number, since it uses as much as digits as its factorization.

22305509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 22305509 is about 4722.8708430360. The cubic root of 22305509 is about 281.4950178263.

The spelling of 22305509 in words is "twenty-two million, three hundred five thousand, five hundred nine".