91891946071 has 2 divisors, whose sum is σ = 91891946072. Its totient is φ = 91891946070.

The previous prime is 91891946039. The next prime is 91891946077. The reversal of 91891946071 is 17064919819.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91891946071 - 2⁵ = 91891946039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91891946077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45945973035 + 45945973036.

It is an arithmetic number, because the mean of its divisors is an integer number (45945973036).

Almost surely, 2^91891946071 is an apocalyptic number.

91891946071 is a deficient number, since it is larger than the sum of its proper divisors (1).

91891946071 is an equidigital number, since it uses as much as digits as its factorization.

91891946071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 55.

The spelling of 91891946071 in words is "ninety-one billion, eight hundred ninety-one million, nine hundred forty-six thousand, seventy-one".