11543111 has 4 divisors (see below), whose sum is σ = 11616792. Its totient is φ = 11469432.

The previous prime is 11543101. The next prime is 11543113. The reversal of 11543111 is 11134511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11134511 = 887 ⋅12553.

It is a cyclic number.

It is not a de Polignac number, because 11543111 - 2⁶ = 11543047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11543111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11543113) 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, 36605 + ... + 36918.

It is an arithmetic number, because the mean of its divisors is an integer number (2904198).

Almost surely, 2^11543111 is an apocalyptic number.

11543111 is a deficient number, since it is larger than the sum of its proper divisors (73681).

11543111 is an equidigital number, since it uses as much as digits as its factorization.

11543111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73680.

The product of its digits is 60, while the sum is 17.

The square root of 11543111 is about 3397.5154157119. The cubic root of 11543111 is about 225.9995757948. Note that the first 3 decimals are identical.

Adding to 11543111 its reverse (11134511), we get a palindrome (22677622).

The spelling of 11543111 in words is "eleven million, five hundred forty-three thousand, one hundred eleven".