71984191 has 2 divisors, whose sum is σ = 71984192. Its totient is φ = 71984190.

The previous prime is 71984173. The next prime is 71984207. The reversal of 71984191 is 19148917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71984191 - 2⁹ = 71983679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71984161) 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, 35992095 + 35992096.

It is an arithmetic number, because the mean of its divisors is an integer number (35992096).

Almost surely, 2^71984191 is an apocalyptic number.

71984191 is a deficient number, since it is larger than the sum of its proper divisors (1).

71984191 is an equidigital number, since it uses as much as digits as its factorization.

71984191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 40.

The square root of 71984191 is about 8484.3497688391. The cubic root of 71984191 is about 415.9863141916.

The spelling of 71984191 in words is "seventy-one million, nine hundred eighty-four thousand, one hundred ninety-one".