23209997 has 2 divisors, whose sum is σ = 23209998. Its totient is φ = 23209996.

The previous prime is 23209993. The next prime is 23210003. The reversal of 23209997 is 79990232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11792356 + 11417641 = 3434^2 + 3379^2 .

It is a cyclic number.

It is not a de Polignac number, because 23209997 - 2² = 23209993 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 (23209993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11604998 + 11604999.

It is an arithmetic number, because the mean of its divisors is an integer number (11604999).

Almost surely, 2^23209997 is an apocalyptic number.

It is an amenable number.

23209997 is a deficient number, since it is larger than the sum of its proper divisors (1).

23209997 is an equidigital number, since it uses as much as digits as its factorization.

23209997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 23209997 is about 4817.6754768249. The cubic root of 23209997 is about 285.2495895036.

The spelling of 23209997 in words is "twenty-three million, two hundred nine thousand, nine hundred ninety-seven".