129976833529 has 9 divisors (see below), whose sum is σ = 130542778639. Its totient is φ = 129413336080.

The previous prime is 129976833527. The next prime is 129976833559. The reversal of 129976833529 is 925338679921.

The square root of 129976833529 is 360523.

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., 87836955129 + 42139878400 = 296373^2 + 205280^2 .

It is not a de Polignac number, because 129976833529 - 2¹ = 129976833527 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129976833523) 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, 101306322 + ... + 101307604.

Almost surely, 2^129976833529 is an apocalyptic number.

129976833529 is the 360523-rd square number.

129976833529 is the 180262-nd centered octagonal number.

It is an amenable number.

129976833529 is a deficient number, since it is larger than the sum of its proper divisors (565945110).

129976833529 is an frugal number, since it uses more digits than its factorization.

129976833529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128 (or 1564 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 64.

Multiplying 129976833529 by its sum of digits (64), we get a square (8318517345856 = 2884184²).

The spelling of 129976833529 in words is "one hundred twenty-nine billion, nine hundred seventy-six million, eight hundred thirty-three thousand, five hundred twenty-nine".