23120309 has 2 divisors, whose sum is σ = 23120310. Its totient is φ = 23120308.

The previous prime is 23120303. The next prime is 23120311. The reversal of 23120309 is 90302132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22515025 + 605284 = 4745^2 + 778^2 .

It is a cyclic number.

It is not a de Polignac number, because 23120309 - 2¹² = 23116213 is a prime.

It is a Sophie Germain prime.

Together with 23120311, 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 (23120303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560154 + 11560155.

It is an arithmetic number, because the mean of its divisors is an integer number (11560155).

Almost surely, 2^23120309 is an apocalyptic number.

It is an amenable number.

23120309 is a deficient number, since it is larger than the sum of its proper divisors (1).

23120309 is an equidigital number, since it uses as much as digits as its factorization.

23120309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 23120309 is about 4808.3582437252. The cubic root of 23120309 is about 284.8816950242.

The spelling of 23120309 in words is "twenty-three million, one hundred twenty thousand, three hundred nine".