23195209 has 2 divisors, whose sum is σ = 23195210. Its totient is φ = 23195208.

The previous prime is 23195177. The next prime is 23195233. The reversal of 23195209 is 90259132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 727609 = 4740^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 23195209 - 2⁵ = 23195177 is a prime.

It is not a weakly prime, because it can be changed into another prime (23195279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11597604 + 11597605.

It is an arithmetic number, because the mean of its divisors is an integer number (11597605).

Almost surely, 2^23195209 is an apocalyptic number.

It is an amenable number.

23195209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23195209 is an equidigital number, since it uses as much as digits as its factorization.

23195209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 23195209 is about 4816.1404672206. The cubic root of 23195209 is about 285.1889953967.

It can be divided in two parts, 2319520 and 9, that added together give a square (2319529 = 1523²).

The spelling of 23195209 in words is "twenty-three million, one hundred ninety-five thousand, two hundred nine".