991036134 has 112 divisors (see below), whose sum is σ = 2473730064. Its totient is φ = 295099200.

The previous prime is 991036127. The next prime is 991036147. The reversal of 991036134 is 431630199.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 977812 + ... + 978824.

Almost surely, 2^991036134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 991036134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1236865032).

991036134 is an abundant number, since it is smaller than the sum of its proper divisors (1482693930).

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

991036134 is a wasteful number, since it uses less digits than its factorization.

991036134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 991036134 is about 31480.7263893323. The cubic root of 991036134 is about 997.0030720620.

The spelling of 991036134 in words is "nine hundred ninety-one million, thirty-six thousand, one hundred thirty-four".