13771391 has 4 divisors (see below), whose sum is σ = 13815984. Its totient is φ = 13726800.

The previous prime is 13771379. The next prime is 13771393. The reversal of 13771391 is 19317731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13771391 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 (13771393) 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, 21830 + ... + 22451.

It is an arithmetic number, because the mean of its divisors is an integer number (3453996).

Almost surely, 2^13771391 is an apocalyptic number.

13771391 is a deficient number, since it is larger than the sum of its proper divisors (44593).

13771391 is an equidigital number, since it uses as much as digits as its factorization.

13771391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44592.

The product of its digits is 3969, while the sum is 32.

The square root of 13771391 is about 3710.9824844642. The cubic root of 13771391 is about 239.6951627418.

The spelling of 13771391 in words is "thirteen million, seven hundred seventy-one thousand, three hundred ninety-one".