11566534 has 32 divisors (see below), whose sum is σ = 21196800. Its totient is φ = 4626720.

The previous prime is 11566531. The next prime is 11566543. The reversal of 11566534 is 43566511.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 11566496 and 11566505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11566531) 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 15 ways as a sum of consecutive naturals, for example, 12127 + ... + 13045.

It is an arithmetic number, because the mean of its divisors is an integer number (662400).

Almost surely, 2^11566534 is an apocalyptic number.

11566534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

11566534 is a deficient number, since it is larger than the sum of its proper divisors (9630266).

11566534 is a wasteful number, since it uses less digits than its factorization.

11566534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its digits is 10800, while the sum is 31.

The square root of 11566534 is about 3400.9607466126. The cubic root of 11566534 is about 226.1523367952.

It can be divided in two parts, 115665 and 34, that multiplied together give a triangular number (3932610 = T₂₈₀₄).

The spelling of 11566534 in words is "eleven million, five hundred sixty-six thousand, five hundred thirty-four".