991093836 has 48 divisors (see below), whose sum is σ = 2339617280. Its totient is φ = 326514240.

The previous prime is 991093783. The next prime is 991093849. The reversal of 991093836 is 638390199.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 746205 + ... + 747531.

Almost surely, 2^991093836 is an apocalyptic number.

It is an amenable number.

991093836 is an abundant number, since it is smaller than the sum of its proper divisors (1348523444).

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

991093836 is a wasteful number, since it uses less digits than its factorization.

991093836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014 (or 2012 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 991093836 is about 31481.6428415037. The cubic root of 991093836 is about 997.0224214926.

The spelling of 991093836 in words is "nine hundred ninety-one million, ninety-three thousand, eight hundred thirty-six".