991108012 has 12 divisors (see below), whose sum is σ = 1737759016. Its totient is φ = 494605440.

The previous prime is 991107967. The next prime is 991108033. The reversal of 991108012 is 210801199.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234789 + ... + 238972.

Almost surely, 2^991108012 is an apocalyptic number.

It is an amenable number.

991108012 is a deficient number, since it is larger than the sum of its proper divisors (746651004).

991108012 is a wasteful number, since it uses less digits than its factorization.

991108012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474288 (or 474286 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 991108012 is about 31481.8679877799. The cubic root of 991108012 is about 997.0271750696.

The spelling of 991108012 in words is "nine hundred ninety-one million, one hundred eight thousand, twelve".