13821091 has 16 divisors (see below), whose sum is σ = 15048000. Its totient is φ = 12659328.

The previous prime is 13821079. The next prime is 13821121. The reversal of 13821091 is 19012831.

13821091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-13821091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13821061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92685 + ... + 92833.

It is an arithmetic number, because the mean of its divisors is an integer number (940500).

Almost surely, 2^13821091 is an apocalyptic number.

13821091 is a deficient number, since it is larger than the sum of its proper divisors (1226909).

13821091 is a wasteful number, since it uses less digits than its factorization.

13821091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 13821091 is about 3717.6727935632. The cubic root of 13821091 is about 239.9831643283.

The spelling of 13821091 in words is "thirteen million, eight hundred twenty-one thousand, ninety-one".