129636889 has 2 divisors, whose sum is σ = 129636890. Its totient is φ = 129636888.

The previous prime is 129636851. The next prime is 129636961. The reversal of 129636889 is 988636921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117505600 + 12131289 = 10840^2 + 3483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129636889 is a prime.

It is not a weakly prime, because it can be changed into another prime (129636839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64818444 + 64818445.

It is an arithmetic number, because the mean of its divisors is an integer number (64818445).

Almost surely, 2^129636889 is an apocalyptic number.

It is an amenable number.

129636889 is a deficient number, since it is larger than the sum of its proper divisors (1).

129636889 is an equidigital number, since it uses as much as digits as its factorization.

129636889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 52.

The square root of 129636889 is about 11385.8196455064. The cubic root of 129636889 is about 506.1076091132.

The spelling of 129636889 in words is "one hundred twenty-nine million, six hundred thirty-six thousand, eight hundred eighty-nine".