13771891 has 12 divisors (see below), whose sum is σ = 16325712. Its totient is φ = 11579568.

The previous prime is 13771847. The next prime is 13771907. The reversal of 13771891 is 19817731.

13771891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13771891 - 2⁷ = 13771763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13771891.

It is not an unprimeable number, because it can be changed into a prime (13771801) 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 11 ways as a sum of consecutive naturals, for example, 55 + ... + 5248.

It is an arithmetic number, because the mean of its divisors is an integer number (1360476).

Almost surely, 2^13771891 is an apocalyptic number.

13771891 is a deficient number, since it is larger than the sum of its proper divisors (2553821).

13771891 is an equidigital number, since it uses as much as digits as its factorization.

13771891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370 (or 5363 counting only the distinct ones).

The product of its digits is 10584, while the sum is 37.

The square root of 13771891 is about 3711.0498514571. The cubic root of 13771891 is about 239.6980635897.

The spelling of 13771891 in words is "thirteen million, seven hundred seventy-one thousand, eight hundred ninety-one".