23171865949 has 2 divisors, whose sum is σ = 23171865950. Its totient is φ = 23171865948.

The previous prime is 23171865931. The next prime is 23171865991. The reversal of 23171865949 is 94956817132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21995856100 + 1176009849 = 148310^2 + 34293^2 .

It is a cyclic number.

It is not a de Polignac number, because 23171865949 - 2⁵ = 23171865917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23171865949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23171865149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11585932974 + 11585932975.

It is an arithmetic number, because the mean of its divisors is an integer number (11585932975).

Almost surely, 2^23171865949 is an apocalyptic number.

It is an amenable number.

23171865949 is a deficient number, since it is larger than the sum of its proper divisors (1).

23171865949 is an equidigital number, since it uses as much as digits as its factorization.

23171865949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 55.

The spelling of 23171865949 in words is "twenty-three billion, one hundred seventy-one million, eight hundred sixty-five thousand, nine hundred forty-nine".