11991943 has 2 divisors, whose sum is σ = 11991944. Its totient is φ = 11991942.

The previous prime is 11991937. The next prime is 11991977. The reversal of 11991943 is 34919911.

11991943 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11991943 - 2⁵ = 11991911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11991913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5995971 + 5995972.

It is an arithmetic number, because the mean of its divisors is an integer number (5995972).

Almost surely, 2^11991943 is an apocalyptic number.

11991943 is a deficient number, since it is larger than the sum of its proper divisors (1).

11991943 is an equidigital number, since it uses as much as digits as its factorization.

11991943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 37.

The square root of 11991943 is about 3462.9384920902. The cubic root of 11991943 is about 228.8915983575.

The spelling of 11991943 in words is "eleven million, nine hundred ninety-one thousand, nine hundred forty-three".