13506563 has 4 divisors (see below), whose sum is σ = 15436080. Its totient is φ = 11577048.

The previous prime is 13506557. The next prime is 13506583. The reversal of 13506563 is 36560531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36560531 = 7 ⋅5222933.

It is not a de Polignac number, because 13506563 - 2⁸ = 13506307 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (13506523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964748 + ... + 964761.

It is an arithmetic number, because the mean of its divisors is an integer number (3859020).

Almost surely, 2^13506563 is an apocalyptic number.

13506563 is a deficient number, since it is larger than the sum of its proper divisors (1929517).

13506563 is an equidigital number, since it uses as much as digits as its factorization.

13506563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929516.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 13506563 is about 3675.1276168318. The cubic root of 13506563 is about 238.1487371482.

The spelling of 13506563 in words is "thirteen million, five hundred six thousand, five hundred sixty-three".