991001102 has 64 divisors (see below), whose sum is σ = 1891620864. Its totient is φ = 378967680.

The previous prime is 991001093. The next prime is 991001129. The reversal of 991001102 is 201100199.

991001102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 684143 + ... + 685589.

It is an arithmetic number, because the mean of its divisors is an integer number (29556576).

Almost surely, 2^991001102 is an apocalyptic number.

991001102 is a deficient number, since it is larger than the sum of its proper divisors (900619762).

991001102 is a wasteful number, since it uses less digits than its factorization.

991001102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 991001102 is about 31480.1699804814. The cubic root of 991001102 is about 996.9913242821.

The spelling of 991001102 in words is "nine hundred ninety-one million, one thousand, one hundred two".