11556863 has 4 divisors (see below), whose sum is σ = 11627928. Its totient is φ = 11485800.

The previous prime is 11556859. The next prime is 11556907. The reversal of 11556863 is 36865511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11556863 - 2² = 11556859 is a prime.

It is a super-2 number, since 2×11556863² = 267122164801538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556803) 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, 35288 + ... + 35613.

It is an arithmetic number, because the mean of its divisors is an integer number (2906982).

Almost surely, 2^11556863 is an apocalyptic number.

11556863 is a deficient number, since it is larger than the sum of its proper divisors (71065).

11556863 is an equidigital number, since it uses as much as digits as its factorization.

11556863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71064.

The product of its digits is 21600, while the sum is 35.

The square root of 11556863 is about 3399.5386451694. The cubic root of 11556863 is about 226.0892891241.

The spelling of 11556863 in words is "eleven million, five hundred fifty-six thousand, eight hundred sixty-three".