991089110 has 16 divisors (see below), whose sum is σ = 1946138832. Its totient is φ = 360396000.

The previous prime is 991089109. The next prime is 991089119. The reversal of 991089110 is 11980199.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991089119) 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, 4504841 + ... + 4505060.

It is an arithmetic number, because the mean of its divisors is an integer number (121633677).

Almost surely, 2^991089110 is an apocalyptic number.

991089110 is a deficient number, since it is larger than the sum of its proper divisors (955049722).

991089110 is a wasteful number, since it uses less digits than its factorization.

991089110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9009919.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 991089110 is about 31481.5677817989. The cubic root of 991089110 is about 997.0208367333.

It can be divided in two parts, 991089 and 110, that added together give a palindrome (991199).

The spelling of 991089110 in words is "nine hundred ninety-one million, eighty-nine thousand, one hundred ten".