23145209 has 2 divisors, whose sum is σ = 23145210. Its totient is φ = 23145208.

The previous prime is 23145203. The next prime is 23145271. The reversal of 23145209 is 90254132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 4826809 = 4280^2 + 2197^2 .

It is a cyclic number.

It is not a de Polignac number, because 23145209 - 2¹⁶ = 23079673 is a prime.

It is not a weakly prime, because it can be changed into another prime (23145203) 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, 11572604 + 11572605.

It is an arithmetic number, because the mean of its divisors is an integer number (11572605).

Almost surely, 2^23145209 is an apocalyptic number.

It is an amenable number.

23145209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23145209 is an equidigital number, since it uses as much as digits as its factorization.

23145209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 23145209 is about 4810.9467883152. The cubic root of 23145209 is about 284.9839285079.

The spelling of 23145209 in words is "twenty-three million, one hundred forty-five thousand, two hundred nine".