23129189 has 2 divisors, whose sum is σ = 23129190. Its totient is φ = 23129188.

The previous prime is 23129167. The next prime is 23129201. The reversal of 23129189 is 98192132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22420225 + 708964 = 4735^2 + 842^2 .

It is a cyclic number.

It is not a de Polignac number, because 23129189 - 2²⁰ = 22080613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23129159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11564594 + 11564595.

It is an arithmetic number, because the mean of its divisors is an integer number (11564595).

Almost surely, 2^23129189 is an apocalyptic number.

It is an amenable number.

23129189 is a deficient number, since it is larger than the sum of its proper divisors (1).

23129189 is an equidigital number, since it uses as much as digits as its factorization.

23129189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 23129189 is about 4809.2815471752. The cubic root of 23129189 is about 284.9181626113.

The spelling of 23129189 in words is "twenty-three million, one hundred twenty-nine thousand, one hundred eighty-nine".