11861543 has 4 divisors (see below), whose sum is σ = 11868648. Its totient is φ = 11854440.

The previous prime is 11861539. The next prime is 11861569. The reversal of 11861543 is 34516811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34516811 = 7 ⋅4930973.

It is a cyclic number.

It is not a de Polignac number, because 11861543 - 2² = 11861539 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 (11861573) 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, 473 + ... + 4893.

It is an arithmetic number, because the mean of its divisors is an integer number (2967162).

Almost surely, 2^11861543 is an apocalyptic number.

11861543 is a deficient number, since it is larger than the sum of its proper divisors (7105).

11861543 is an equidigital number, since it uses as much as digits as its factorization.

11861543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104.

The product of its digits is 2880, while the sum is 29.

The square root of 11861543 is about 3444.0590877626. The cubic root of 11861543 is about 228.0589195732.

The spelling of 11861543 in words is "eleven million, eight hundred sixty-one thousand, five hundred forty-three".