129623189 has 2 divisors, whose sum is σ = 129623190. Its totient is φ = 129623188.

The previous prime is 129623171. The next prime is 129623233. The reversal of 129623189 is 981326921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121727089 + 7896100 = 11033^2 + 2810^2 .

It is a cyclic number.

It is not a de Polignac number, because 129623189 - 2¹² = 129619093 is a prime.

It is a super-2 number, since 2×129623189² = 33604342253059442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129623089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64811594 + 64811595.

It is an arithmetic number, because the mean of its divisors is an integer number (64811595).

Almost surely, 2^129623189 is an apocalyptic number.

It is an amenable number.

129623189 is a deficient number, since it is larger than the sum of its proper divisors (1).

129623189 is an equidigital number, since it uses as much as digits as its factorization.

129623189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 129623189 is about 11385.2180040612. The cubic root of 129623189 is about 506.0897800355.

The spelling of 129623189 in words is "one hundred twenty-nine million, six hundred twenty-three thousand, one hundred eighty-nine".