11971943 has 2 divisors, whose sum is σ = 11971944. Its totient is φ = 11971942.

The previous prime is 11971913. The next prime is 11971987. The reversal of 11971943 is 34917911.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11971943 - 2⁶ = 11971879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11971913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5985971 + 5985972.

It is an arithmetic number, because the mean of its divisors is an integer number (5985972).

Almost surely, 2^11971943 is an apocalyptic number.

11971943 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971943 is an equidigital number, since it uses as much as digits as its factorization.

11971943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 35.

The square root of 11971943 is about 3460.0495661190. The cubic root of 11971943 is about 228.7642801162.

The spelling of 11971943 in words is "eleven million, nine hundred seventy-one thousand, nine hundred forty-three".