13869481 has 2 divisors, whose sum is σ = 13869482. Its totient is φ = 13869480.

The previous prime is 13869461. The next prime is 13869491. The reversal of 13869481 is 18496831.

13869481 is digitally balanced in base 2, 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., 11451456 + 2418025 = 3384^2 + 1555^2 .

It is an emirp because it is prime and its reverse (18496831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13869481 - 2¹⁹ = 13345193 is a prime.

It is a super-2 number, since 2×13869481² = 384725006418722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13869451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6934740 + 6934741.

It is an arithmetic number, because the mean of its divisors is an integer number (6934741).

Almost surely, 2^13869481 is an apocalyptic number.

It is an amenable number.

13869481 is a deficient number, since it is larger than the sum of its proper divisors (1).

13869481 is an equidigital number, since it uses as much as digits as its factorization.

13869481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 13869481 is about 3724.1752107010. The cubic root of 13869481 is about 240.2629121147.

The spelling of 13869481 in words is "thirteen million, eight hundred sixty-nine thousand, four hundred eighty-one".