129728959 has 2 divisors, whose sum is σ = 129728960. Its totient is φ = 129728958.

The previous prime is 129728939. The next prime is 129728969. The reversal of 129728959 is 959827921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129728959 - 2⁵ = 129728927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129728909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64864479 + 64864480.

It is an arithmetic number, because the mean of its divisors is an integer number (64864480).

Almost surely, 2^129728959 is an apocalyptic number.

129728959 is a deficient number, since it is larger than the sum of its proper divisors (1).

129728959 is an equidigital number, since it uses as much as digits as its factorization.

129728959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The square root of 129728959 is about 11389.8621150565. The cubic root of 129728959 is about 506.2273957494.

The spelling of 129728959 in words is "one hundred twenty-nine million, seven hundred twenty-eight thousand, nine hundred fifty-nine".