13913891 has 2 divisors, whose sum is σ = 13913892. Its totient is φ = 13913890.

The previous prime is 13913869. The next prime is 13913899. The reversal of 13913891 is 19831931.

13913891 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 13913891 - 2¹⁰ = 13912867 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (13913899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6956945 + 6956946.

It is an arithmetic number, because the mean of its divisors is an integer number (6956946).

Almost surely, 2^13913891 is an apocalyptic number.

13913891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13913891 is an equidigital number, since it uses as much as digits as its factorization.

13913891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 13913891 is about 3730.1328394576. The cubic root of 13913891 is about 240.5190790575.

The spelling of 13913891 in words is "thirteen million, nine hundred thirteen thousand, eight hundred ninety-one".