19991030112 has 36 divisors (see below), whose sum is σ = 56849492700. Its totient is φ = 6663676608.

The previous prime is 19991030069. The next prime is 19991030117. The reversal of 19991030112 is 21103019991.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19991030117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34706362 + ... + 34706937.

It is an arithmetic number, because the mean of its divisors is an integer number (1579152575).

Almost surely, 2^19991030112 is an apocalyptic number.

19991030112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19991030112 is an abundant number, since it is smaller than the sum of its proper divisors (36858462588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19991030112 is a wasteful number, since it uses less digits than its factorization.

19991030112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69413315 (or 69413304 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The spelling of 19991030112 in words is "nineteen billion, nine hundred ninety-one million, thirty thousand, one hundred twelve".