11985971 has 2 divisors, whose sum is σ = 11985972. Its totient is φ = 11985970.

The previous prime is 11985937. The next prime is 11985977. The reversal of 11985971 is 17958911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11985971 - 2⁶ = 11985907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11985977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5992985 + 5992986.

It is an arithmetic number, because the mean of its divisors is an integer number (5992986).

Almost surely, 2^11985971 is an apocalyptic number.

11985971 is a deficient number, since it is larger than the sum of its proper divisors (1).

11985971 is an equidigital number, since it uses as much as digits as its factorization.

11985971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 41.

The square root of 11985971 is about 3462.0761112373. The cubic root of 11985971 is about 228.8535959642.

The spelling of 11985971 in words is "eleven million, nine hundred eighty-five thousand, nine hundred seventy-one".