13871491 has 2 divisors, whose sum is σ = 13871492. Its totient is φ = 13871490.

The previous prime is 13871471. The next prime is 13871503. The reversal of 13871491 is 19417831.

13871491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13871491 - 2⁹ = 13870979 is a prime.

It is not a weakly prime, because it can be changed into another prime (13871471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6935745 + 6935746.

It is an arithmetic number, because the mean of its divisors is an integer number (6935746).

Almost surely, 2^13871491 is an apocalyptic number.

13871491 is a deficient number, since it is larger than the sum of its proper divisors (1).

13871491 is an equidigital number, since it uses as much as digits as its factorization.

13871491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 13871491 is about 3724.4450593343. The cubic root of 13871491 is about 240.2745180555.

The spelling of 13871491 in words is "thirteen million, eight hundred seventy-one thousand, four hundred ninety-one".