13667861 has 2 divisors, whose sum is σ = 13667862. Its totient is φ = 13667860.

The previous prime is 13667827. The next prime is 13667891. The reversal of 13667861 is 16876631.

13667861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10080625 + 3587236 = 3175^2 + 1894^2 .

It is a cyclic number.

It is not a de Polignac number, because 13667861 - 2²² = 9473557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13667891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6833930 + 6833931.

It is an arithmetic number, because the mean of its divisors is an integer number (6833931).

Almost surely, 2^13667861 is an apocalyptic number.

It is an amenable number.

13667861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13667861 is an equidigital number, since it uses as much as digits as its factorization.

13667861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 13667861 is about 3697.0070327226. The cubic root of 13667861 is about 239.0929943956.

The spelling of 13667861 in words is "thirteen million, six hundred sixty-seven thousand, eight hundred sixty-one".