13571891 has 2 divisors, whose sum is σ = 13571892. Its totient is φ = 13571890.

The previous prime is 13571867. The next prime is 13571903. The reversal of 13571891 is 19817531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13571891 - 2⁶ = 13571827 is a prime.

It is not a weakly prime, because it can be changed into another prime (13571851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6785945 + 6785946.

It is an arithmetic number, because the mean of its divisors is an integer number (6785946).

Almost surely, 2^13571891 is an apocalyptic number.

13571891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13571891 is an equidigital number, since it uses as much as digits as its factorization.

13571891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 35.

The square root of 13571891 is about 3684.0047502684. The cubic root of 13571891 is about 238.5320758457.

Subtracting from 13571891 its sum of digits (35), we obtain a square (13571856 = 3684²).

The spelling of 13571891 in words is "thirteen million, five hundred seventy-one thousand, eight hundred ninety-one".