991020110 has 16 divisors (see below), whose sum is σ = 1795201056. Its totient is φ = 393882528.

The previous prime is 991020089. The next prime is 991020167. The reversal of 991020110 is 11020199.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314042 + ... + 317181.

It is an arithmetic number, because the mean of its divisors is an integer number (112200066).

Almost surely, 2^991020110 is an apocalyptic number.

991020110 is a deficient number, since it is larger than the sum of its proper divisors (804180946).

991020110 is a wasteful number, since it uses less digits than its factorization.

991020110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631387.

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

The square root of 991020110 is about 31480.4718833756. The cubic root of 991020110 is about 996.9976985400.

The spelling of 991020110 in words is "nine hundred ninety-one million, twenty thousand, one hundred ten".