129285550969 has 3 divisors (see below), whose sum is σ = 129285910533. Its totient is φ = 129285191406.

The previous prime is 129285550949. The next prime is 129285551009. The reversal of 129285550969 is 969055582921.

The square root of 129285550969 is 359563.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 129285550969 - 2³⁵ = 94925812601 is a prime.

It is a super-2 number, since 2×129285550969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129285550949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 179782 + ... + 539344.

It is an arithmetic number, because the mean of its divisors is an integer number (43095303511).

Almost surely, 2^129285550969 is an apocalyptic number.

129285550969 is the 359563-rd square number.

129285550969 is the 179782-nd centered octagonal number.

It is an amenable number.

129285550969 is a deficient number, since it is larger than the sum of its proper divisors (359564).

129285550969 is an frugal number, since it uses more digits than its factorization.

129285550969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719126 (or 359563 counting only the distinct ones).

The product of its (nonzero) digits is 17496000, while the sum is 61.

The spelling of 129285550969 in words is "one hundred twenty-nine billion, two hundred eighty-five million, five hundred fifty thousand, nine hundred sixty-nine".