13878281 has 2 divisors, whose sum is σ = 13878282. Its totient is φ = 13878280.

The previous prime is 13878229. The next prime is 13878283. The reversal of 13878281 is 18287831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13388281 + 490000 = 3659^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 13878281 - 2⁶ = 13878217 is a prime.

It is a super-2 number, since 2×13878281² = 385213367029922, which contains 22 as substring.

Together with 13878283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13878283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6939140 + 6939141.

It is an arithmetic number, because the mean of its divisors is an integer number (6939141).

Almost surely, 2^13878281 is an apocalyptic number.

It is an amenable number.

13878281 is a deficient number, since it is larger than the sum of its proper divisors (1).

13878281 is an equidigital number, since it uses as much as digits as its factorization.

13878281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 13878281 is about 3725.3564930084. The cubic root of 13878281 is about 240.3137159051.

The spelling of 13878281 in words is "thirteen million, eight hundred seventy-eight thousand, two hundred eighty-one".