13721091 has 8 divisors (see below), whose sum is σ = 19371024. Its totient is φ = 8609280.

The previous prime is 13721063. The next prime is 13721093. The reversal of 13721091 is 19012731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13721091 - 2¹⁴ = 13704707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13721093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134470 + ... + 134571.

It is an arithmetic number, because the mean of its divisors is an integer number (2421378).

Almost surely, 2^13721091 is an apocalyptic number.

13721091 is a deficient number, since it is larger than the sum of its proper divisors (5649933).

13721091 is a wasteful number, since it uses less digits than its factorization.

13721091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269061.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 13721091 is about 3704.1991037200. The cubic root of 13721091 is about 239.4029778895.

The spelling of 13721091 in words is "thirteen million, seven hundred twenty-one thousand, ninety-one".