23213209 has 2 divisors, whose sum is σ = 23213210. Its totient is φ = 23213208.

The previous prime is 23213189. The next prime is 23213219. The reversal of 23213209 is 90231232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23068809 + 144400 = 4803^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 23213209 - 2¹⁵ = 23180441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23213209.

It is not a weakly prime, because it can be changed into another prime (23213219) 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, 11606604 + 11606605.

It is an arithmetic number, because the mean of its divisors is an integer number (11606605).

Almost surely, 2^23213209 is an apocalyptic number.

It is an amenable number.

23213209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23213209 is an equidigital number, since it uses as much as digits as its factorization.

23213209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 23213209 is about 4818.0088210795. The cubic root of 23213209 is about 285.2627473313.

The spelling of 23213209 in words is "twenty-three million, two hundred thirteen thousand, two hundred nine".