13871191 has 4 divisors (see below), whose sum is σ = 13883112. Its totient is φ = 13859272.

The previous prime is 13871183. The next prime is 13871233. The reversal of 13871191 is 19117831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19117831 = 569 ⋅33599.

It is a cyclic number.

It is not a de Polignac number, because 13871191 - 2³ = 13871183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13871141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4000 + ... + 6613.

It is an arithmetic number, because the mean of its divisors is an integer number (3470778).

Almost surely, 2^13871191 is an apocalyptic number.

13871191 is a deficient number, since it is larger than the sum of its proper divisors (11921).

13871191 is a wasteful number, since it uses less digits than its factorization.

13871191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11920.

The product of its digits is 1512, while the sum is 31.

The square root of 13871191 is about 3724.4047846602. The cubic root of 13871191 is about 240.2727858967.

The spelling of 13871191 in words is "thirteen million, eight hundred seventy-one thousand, one hundred ninety-one".