13991110812 has 36 divisors (see below), whose sum is σ = 40418765296. Its totient is φ = 3997460160.

The previous prime is 13991110811. The next prime is 13991110817. The reversal of 13991110812 is 21801119931.

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 (13991110811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27759889 + ... + 27760392.

Almost surely, 2^13991110812 is an apocalyptic number.

13991110812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13991110812 is an abundant number, since it is smaller than the sum of its proper divisors (26427654484).

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

13991110812 is a wasteful number, since it uses less digits than its factorization.

13991110812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55520298 (or 55520293 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 36.

The spelling of 13991110812 in words is "thirteen billion, nine hundred ninety-one million, one hundred ten thousand, eight hundred twelve".