9901129532 has 72 divisors (see below), whose sum is σ = 20334827520. Its totient is φ = 4205869920.

The previous prime is 9901129531. The next prime is 9901129549. The reversal of 9901129532 is 2359211099.

It is a self number, because there is not a number n which added to its sum of digits gives 9901129532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9901129531) 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 23 ways as a sum of consecutive naturals, for example, 15690857 + ... + 15691487.

It is an arithmetic number, because the mean of its divisors is an integer number (282428160).

Almost surely, 2^9901129532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9901129532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10167413760).

9901129532 is an abundant number, since it is smaller than the sum of its proper divisors (10433697988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9901129532 is a wasteful number, since it uses less digits than its factorization.

9901129532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 9901129532 is about 99504.4196606362. The cubic root of 9901129532 is about 2147.3108280029.

The spelling of 9901129532 in words is "nine billion, nine hundred one million, one hundred twenty-nine thousand, five hundred thirty-two".