22236509 has 2 divisors, whose sum is σ = 22236510. Its totient is φ = 22236508.

The previous prime is 22236503. The next prime is 22236541. The reversal of 22236509 is 90563222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16728100 + 5508409 = 4090^2 + 2347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22236509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22236503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11118254 + 11118255.

It is an arithmetic number, because the mean of its divisors is an integer number (11118255).

Almost surely, 2^22236509 is an apocalyptic number.

It is an amenable number.

22236509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22236509 is an equidigital number, since it uses as much as digits as its factorization.

22236509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 22236509 is about 4715.5603060506. The cubic root of 22236509 is about 281.2044585356.

The spelling of 22236509 in words is "twenty-two million, two hundred thirty-six thousand, five hundred nine".