23279309 has 2 divisors, whose sum is σ = 23279310. Its totient is φ = 23279308.

The previous prime is 23279287. The next prime is 23279323. The reversal of 23279309 is 90397232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 7038409 = 4030^2 + 2653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23279309 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 (23279359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11639654 + 11639655.

It is an arithmetic number, because the mean of its divisors is an integer number (11639655).

Almost surely, 2^23279309 is an apocalyptic number.

It is an amenable number.

23279309 is a deficient number, since it is larger than the sum of its proper divisors (1).

23279309 is an equidigital number, since it uses as much as digits as its factorization.

23279309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 23279309 is about 4824.8636250157. The cubic root of 23279309 is about 285.5332542137.

The spelling of 23279309 in words is "twenty-three million, two hundred seventy-nine thousand, three hundred nine".