991101110 has 16 divisors (see below), whose sum is σ = 1791094032. Its totient is φ = 394860000.

The previous prime is 991101103. The next prime is 991101121. The reversal of 991101110 is 11101199.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194921 + ... + 199940.

It is an arithmetic number, because the mean of its divisors is an integer number (111943377).

Almost surely, 2^991101110 is an apocalyptic number.

991101110 is a deficient number, since it is larger than the sum of its proper divisors (799992922).

991101110 is a wasteful number, since it uses less digits than its factorization.

991101110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395119.

The product of its (nonzero) digits is 81, while the sum is 23.

The square root of 991101110 is about 31481.7583689349. The cubic root of 991101110 is about 997.0248606573.

The spelling of 991101110 in words is "nine hundred ninety-one million, one hundred one thousand, one hundred ten".