11816563 has 8 divisors (see below), whose sum is σ = 12925440. Its totient is φ = 10713480.

The previous prime is 11816557. The next prime is 11816573. The reversal of 11816563 is 36561811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11816563 - 2⁵ = 11816531 is a prime.

It is a super-2 number, since 2×11816563² = 279262322265938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11816533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3606 + ... + 6052.

It is an arithmetic number, because the mean of its divisors is an integer number (1615680).

Almost surely, 2^11816563 is an apocalyptic number.

11816563 is a deficient number, since it is larger than the sum of its proper divisors (1108877).

11816563 is a wasteful number, since it uses less digits than its factorization.

11816563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897.

The product of its digits is 4320, while the sum is 31.

The square root of 11816563 is about 3437.5227999244. The cubic root of 11816563 is about 227.7702813493.

It can be divided in two parts, 1181 and 6563, that added together give a square (7744 = 88²).

The spelling of 11816563 in words is "eleven million, eight hundred sixteen thousand, five hundred sixty-three".