129552969 has 32 divisors (see below), whose sum is σ = 215326720. Its totient is φ = 67459392.

The previous prime is 129552961. The next prime is 129553007. The reversal of 129552969 is 969255921.

It is a happy number.

It is not a de Polignac number, because 129552969 - 2³ = 129552961 is a prime.

It is a super-2 number, since 2×129552969² = 33567943553429922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129552961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18564 + ... + 24570.

It is an arithmetic number, because the mean of its divisors is an integer number (6728960).

Almost surely, 2^129552969 is an apocalyptic number.

It is an amenable number.

129552969 is a deficient number, since it is larger than the sum of its proper divisors (85773751).

129552969 is a wasteful number, since it uses less digits than its factorization.

129552969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6109.

The product of its digits is 437400, while the sum is 48.

The square root of 129552969 is about 11382.1337630516. The cubic root of 129552969 is about 505.9983765252.

The spelling of 129552969 in words is "one hundred twenty-nine million, five hundred fifty-two thousand, nine hundred sixty-nine".