11543543 has 4 divisors (see below), whose sum is σ = 12592968. Its totient is φ = 10494120.

The previous prime is 11543503. The next prime is 11543549. The reversal of 11543543 is 34534511.

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 11543543 - 2¹⁸ = 11281399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11543549) 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 3 ways as a sum of consecutive naturals, for example, 524696 + ... + 524717.

It is an arithmetic number, because the mean of its divisors is an integer number (3148242).

Almost surely, 2^11543543 is an apocalyptic number.

11543543 is a deficient number, since it is larger than the sum of its proper divisors (1049425).

11543543 is a wasteful number, since it uses less digits than its factorization.

11543543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049424.

The product of its digits is 3600, while the sum is 26.

The square root of 11543543 is about 3397.5789909876. The cubic root of 11543543 is about 226.0023950982.

The spelling of 11543543 in words is "eleven million, five hundred forty-three thousand, five hundred forty-three".