13661447 has 2 divisors, whose sum is σ = 13661448. Its totient is φ = 13661446.

The previous prime is 13661429. The next prime is 13661449. The reversal of 13661447 is 74416631.

It is a strong prime.

It is an emirp because it is prime and its reverse (74416631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13661447 - 2⁸ = 13661191 is a prime.

Together with 13661449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13661449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6830723 + 6830724.

It is an arithmetic number, because the mean of its divisors is an integer number (6830724).

Almost surely, 2^13661447 is an apocalyptic number.

13661447 is a deficient number, since it is larger than the sum of its proper divisors (1).

13661447 is an equidigital number, since it uses as much as digits as its factorization.

13661447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 32.

The square root of 13661447 is about 3696.1394724767. The cubic root of 13661447 is about 239.0555883373.

The spelling of 13661447 in words is "thirteen million, six hundred sixty-one thousand, four hundred forty-seven".