991107 has 24 divisors (see below), whose sum is σ = 1585584. Its totient is φ = 592704.

The previous prime is 991091. The next prime is 991127. The reversal of 991107 is 701199.

It is not a de Polignac number, because 991107 - 2⁴ = 991091 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (991127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4933 + ... + 5129.

It is an arithmetic number, because the mean of its divisors is an integer number (66066).

2⁹⁹¹¹⁰⁷ is an apocalyptic number.

991107 is a deficient number, since it is larger than the sum of its proper divisors (594477).

991107 is a wasteful number, since it uses less digits than its factorization.

991107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 991107 is about 995.5435701163. The cubic root of 991107 is about 99.7026835721.

The spelling of 991107 in words is "nine hundred ninety-one thousand, one hundred seven".