13563887 has 2 divisors, whose sum is σ = 13563888. Its totient is φ = 13563886.

The previous prime is 13563857. The next prime is 13563889. The reversal of 13563887 is 78836531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13563887 - 2¹⁴ = 13547503 is a prime.

Together with 13563889, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₈₈₃₄₉₉ and since 13563887 and 883499 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13563889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6781943 + 6781944.

It is an arithmetic number, because the mean of its divisors is an integer number (6781944).

Almost surely, 2^13563887 is an apocalyptic number.

13563887 is a deficient number, since it is larger than the sum of its proper divisors (1).

13563887 is an equidigital number, since it uses as much as digits as its factorization.

13563887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 13563887 is about 3682.9182722401. The cubic root of 13563887 is about 238.4851753271.

The spelling of 13563887 in words is "thirteen million, five hundred sixty-three thousand, eight hundred eighty-seven".