23198209 has 2 divisors, whose sum is σ = 23198210. Its totient is φ = 23198208.

The previous prime is 23198207. The next prime is 23198233. The reversal of 23198209 is 90289132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19607184 + 3591025 = 4428^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 23198209 - 2¹ = 23198207 is a prime.

Together with 23198207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23198207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11599104 + 11599105.

It is an arithmetic number, because the mean of its divisors is an integer number (11599105).

Almost surely, 2^23198209 is an apocalyptic number.

It is an amenable number.

23198209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23198209 is an equidigital number, since it uses as much as digits as its factorization.

23198209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 23198209 is about 4816.4519098606. The cubic root of 23198209 is about 285.2012900348.

The spelling of 23198209 in words is "twenty-three million, one hundred ninety-eight thousand, two hundred nine".