129530961 has 48 divisors (see below), whose sum is σ = 235022400. Its totient is φ = 70108416.

The previous prime is 129530959. The next prime is 129531011. The reversal of 129530961 is 169035921.

129530961 is a `hidden beast` number, since 1 + 295 + 309 + 61 = 666.

It is not a de Polignac number, because 129530961 - 2¹ = 129530959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129530911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22561 + ... + 27713.

It is an arithmetic number, because the mean of its divisors is an integer number (4896300).

Almost surely, 2^129530961 is an apocalyptic number.

It is an amenable number.

129530961 is a deficient number, since it is larger than the sum of its proper divisors (105491439).

129530961 is a wasteful number, since it uses less digits than its factorization.

129530961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195 (or 5182 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 129530961 is about 11381.1669436838. The cubic root of 129530961 is about 505.9697224979.

The spelling of 129530961 in words is "one hundred twenty-nine million, five hundred thirty thousand, nine hundred sixty-one".