129504257689 has 9 divisors (see below), whose sum is σ = 132601869183. Its totient is φ = 126477416352.

The previous prime is 129504257681. The next prime is 129504257737. The reversal of 129504257689 is 986752405921.

It is a happy number.

The square root of 129504257689 is 359867.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 93707617689 + 35796640000 = 306117^2 + 189200^2 .

It is not a de Polignac number, because 129504257689 - 2³ = 129504257681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129504257681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15470097 + ... + 15478465.

Almost surely, 2^129504257689 is an apocalyptic number.

129504257689 is the 359867-th square number.

129504257689 is the 179934-th centered octagonal number.

It is an amenable number.

129504257689 is a deficient number, since it is larger than the sum of its proper divisors (3097611494).

129504257689 is an frugal number, since it uses more digits than its factorization.

129504257689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16824 (or 8412 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 58.

The spelling of 129504257689 in words is "one hundred twenty-nine billion, five hundred four million, two hundred fifty-seven thousand, six hundred eighty-nine".