22704509 has 2 divisors, whose sum is σ = 22704510. Its totient is φ = 22704508.

The previous prime is 22704481. The next prime is 22704541. The reversal of 22704509 is 90540722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 6528025 = 4022^2 + 2555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22704509 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 (22704589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11352254 + 11352255.

It is an arithmetic number, because the mean of its divisors is an integer number (11352255).

Almost surely, 2^22704509 is an apocalyptic number.

It is an amenable number.

22704509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22704509 is an equidigital number, since it uses as much as digits as its factorization.

22704509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 22704509 is about 4764.9248682429. The cubic root of 22704509 is about 283.1635650417.

The spelling of 22704509 in words is "twenty-two million, seven hundred four thousand, five hundred nine".