23117989 has 2 divisors, whose sum is σ = 23117990. Its totient is φ = 23117988.

The previous prime is 23117981. The next prime is 23117999. The reversal of 23117989 is 98971132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 173889 = 4790^2 + 417^2 .

It is a cyclic number.

It is not a de Polignac number, because 23117989 - 2³ = 23117981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23117981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11558994 + 11558995.

It is an arithmetic number, because the mean of its divisors is an integer number (11558995).

Almost surely, 2^23117989 is an apocalyptic number.

It is an amenable number.

23117989 is a deficient number, since it is larger than the sum of its proper divisors (1).

23117989 is an equidigital number, since it uses as much as digits as its factorization.

23117989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 40.

The square root of 23117989 is about 4808.1169910891. The cubic root of 23117989 is about 284.8721659180.

The spelling of 23117989 in words is "twenty-three million, one hundred seventeen thousand, nine hundred eighty-nine".