22712309 has 2 divisors, whose sum is σ = 22712310. Its totient is φ = 22712308.

The previous prime is 22712303. The next prime is 22712311. The reversal of 22712309 is 90321722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14273284 + 8439025 = 3778^2 + 2905^2 .

It is a cyclic number.

It is not a de Polignac number, because 22712309 - 2²⁴ = 5935093 is a prime.

It is a super-2 number, since 2×22712309² = 1031697960222962, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 22712311, it forms a pair of twin primes.

It is a Chen 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 (22712303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11356154 + 11356155.

It is an arithmetic number, because the mean of its divisors is an integer number (11356155).

Almost surely, 2^22712309 is an apocalyptic number.

It is an amenable number.

22712309 is a deficient number, since it is larger than the sum of its proper divisors (1).

22712309 is an equidigital number, since it uses as much as digits as its factorization.

22712309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 22712309 is about 4765.7432788601. The cubic root of 22712309 is about 283.1959877194.

The spelling of 22712309 in words is "twenty-two million, seven hundred twelve thousand, three hundred nine".