23171789 has 2 divisors, whose sum is σ = 23171790. Its totient is φ = 23171788.

The previous prime is 23171777. The next prime is 23171821. The reversal of 23171789 is 98717132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 2696164 = 4525^2 + 1642^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23171789 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23171389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11585894 + 11585895.

It is an arithmetic number, because the mean of its divisors is an integer number (11585895).

Almost surely, 2^23171789 is an apocalyptic number.

It is an amenable number.

23171789 is a deficient number, since it is larger than the sum of its proper divisors (1).

23171789 is an equidigital number, since it uses as much as digits as its factorization.

23171789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 23171789 is about 4813.7084456789. The cubic root of 23171789 is about 285.0929787942.

The spelling of 23171789 in words is "twenty-three million, one hundred seventy-one thousand, seven hundred eighty-nine".