129189023 has 2 divisors, whose sum is σ = 129189024. Its totient is φ = 129189022.

The previous prime is 129189007. The next prime is 129189077. The reversal of 129189023 is 320981921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129189023 - 2⁴ = 129189007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129189083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64594511 + 64594512.

It is an arithmetic number, because the mean of its divisors is an integer number (64594512).

Almost surely, 2^129189023 is an apocalyptic number.

129189023 is a deficient number, since it is larger than the sum of its proper divisors (1).

129189023 is an equidigital number, since it uses as much as digits as its factorization.

129189023 is an evil number, because the sum of its binary digits is even.

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

The square root of 129189023 is about 11366.1349191359. The cubic root of 129189023 is about 505.5241077050.

The spelling of 129189023 in words is "one hundred twenty-nine million, one hundred eighty-nine thousand, twenty-three".