13997861 has 2 divisors, whose sum is σ = 13997862. Its totient is φ = 13997860.

The previous prime is 13997849. The next prime is 13997873. The reversal of 13997861 is 16879931.

13997861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (13997849) and next prime (13997873).

It can be written as a sum of positive squares in only one way, i.e., 7392961 + 6604900 = 2719^2 + 2570^2 .

It is an emirp because it is prime and its reverse (16879931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13997861 - 2¹⁰ = 13996837 is a prime.

It is a super-2 number, since 2×13997861² = 391880225150642, which contains 22 as substring.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13997801) 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 as a sum of consecutive naturals, namely, 6998930 + 6998931.

It is an arithmetic number, because the mean of its divisors is an integer number (6998931).

Almost surely, 2^13997861 is an apocalyptic number.

It is an amenable number.

13997861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13997861 is an equidigital number, since it uses as much as digits as its factorization.

13997861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 13997861 is about 3741.3715399570. The cubic root of 13997861 is about 241.0019512821.

The spelling of 13997861 in words is "thirteen million, nine hundred ninety-seven thousand, eight hundred sixty-one".