991112836 has 24 divisors (see below), whose sum is σ = 1995537600. Its totient is φ = 421910112.

The previous prime is 991112831. The next prime is 991112839. The reversal of 991112836 is 638211199.

It is not an unprimeable number, because it can be changed into a prime (991112831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114610 + ... + 122953.

It is an arithmetic number, because the mean of its divisors is an integer number (83147400).

Almost surely, 2^991112836 is an apocalyptic number.

It is an amenable number.

991112836 is an abundant number, since it is smaller than the sum of its proper divisors (1004424764).

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

991112836 is a wasteful number, since it uses less digits than its factorization.

991112836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237723 (or 237721 counting only the distinct ones).

The product of its digits is 23328, while the sum is 40.

The square root of 991112836 is about 31481.9446032166. The cubic root of 991112836 is about 997.0287926703.

The spelling of 991112836 in words is "nine hundred ninety-one million, one hundred twelve thousand, eight hundred thirty-six".