11989543 has 2 divisors, whose sum is σ = 11989544. Its totient is φ = 11989542.

The previous prime is 11989531. The next prime is 11989547. The reversal of 11989543 is 34598911.

It is a strong prime.

It is an emirp because it is prime and its reverse (34598911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11989543 - 2⁵ = 11989511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11989496 and 11989505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11989547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5994771 + 5994772.

It is an arithmetic number, because the mean of its divisors is an integer number (5994772).

Almost surely, 2^11989543 is an apocalyptic number.

11989543 is a deficient number, since it is larger than the sum of its proper divisors (1).

11989543 is an equidigital number, since it uses as much as digits as its factorization.

11989543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 11989543 is about 3462.5919482376. The cubic root of 11989543 is about 228.8763276465.

The spelling of 11989543 in words is "eleven million, nine hundred eighty-nine thousand, five hundred forty-three".