13565971 has 2 divisors, whose sum is σ = 13565972. Its totient is φ = 13565970.

The previous prime is 13565969. The next prime is 13565977. The reversal of 13565971 is 17956531.

It is a weak prime.

It is an emirp because it is prime and its reverse (17956531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13565971 - 2¹ = 13565969 is a prime.

Together with 13565969, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13565971.

It is not a weakly prime, because it can be changed into another prime (13565977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6782985 + 6782986.

It is an arithmetic number, because the mean of its divisors is an integer number (6782986).

Almost surely, 2^13565971 is an apocalyptic number.

13565971 is a deficient number, since it is larger than the sum of its proper divisors (1).

13565971 is an equidigital number, since it uses as much as digits as its factorization.

13565971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 37.

The square root of 13565971 is about 3683.2011891831. The cubic root of 13565971 is about 238.4973885827.

The spelling of 13565971 in words is "thirteen million, five hundred sixty-five thousand, nine hundred seventy-one".