71861191 has 2 divisors, whose sum is σ = 71861192. Its totient is φ = 71861190.

The previous prime is 71861149. The next prime is 71861203. The reversal of 71861191 is 19116817.

It is a strong prime.

It is an emirp because it is prime and its reverse (19116817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71861191 - 2⁷ = 71861063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71861291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35930595 + 35930596.

It is an arithmetic number, because the mean of its divisors is an integer number (35930596).

Almost surely, 2^71861191 is an apocalyptic number.

71861191 is a deficient number, since it is larger than the sum of its proper divisors (1).

71861191 is an equidigital number, since it uses as much as digits as its factorization.

71861191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 34.

The square root of 71861191 is about 8477.0980293966. The cubic root of 71861191 is about 415.7492459947.

The spelling of 71861191 in words is "seventy-one million, eight hundred sixty-one thousand, one hundred ninety-one".