11916543 has 4 divisors (see below), whose sum is σ = 15888728. Its totient is φ = 7944360.

The previous prime is 11916539. The next prime is 11916551. The reversal of 11916543 is 34561911.

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

It is not a de Polignac number, because 11916543 - 2² = 11916539 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 11916543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11916503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1986088 + ... + 1986093.

It is an arithmetic number, because the mean of its divisors is an integer number (3972182).

Almost surely, 2^11916543 is an apocalyptic number.

11916543 is a deficient number, since it is larger than the sum of its proper divisors (3972185).

11916543 is an equidigital number, since it uses as much as digits as its factorization.

11916543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972184.

The product of its digits is 3240, while the sum is 30.

The square root of 11916543 is about 3452.0346174394. The cubic root of 11916543 is about 228.4108665723.

The spelling of 11916543 in words is "eleven million, nine hundred sixteen thousand, five hundred forty-three".