13781671 has 4 divisors (see below), whose sum is σ = 13804144. Its totient is φ = 13759200.

The previous prime is 13781653. The next prime is 13781681. The reversal of 13781671 is 17618731.

13781671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 13781671 - 2¹³ = 13773479 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 (13781681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10290 + ... + 11551.

It is an arithmetic number, because the mean of its divisors is an integer number (3451036).

Almost surely, 2^13781671 is an apocalyptic number.

13781671 is a deficient number, since it is larger than the sum of its proper divisors (22473).

13781671 is an equidigital number, since it uses as much as digits as its factorization.

13781671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22472.

The product of its digits is 7056, while the sum is 34.

The square root of 13781671 is about 3712.3673040258. The cubic root of 13781671 is about 239.7547900616.

The spelling of 13781671 in words is "thirteen million, seven hundred eighty-one thousand, six hundred seventy-one".