91891946371 has 2 divisors, whose sum is σ = 91891946372. Its totient is φ = 91891946370.

The previous prime is 91891946347. The next prime is 91891946401. The reversal of 91891946371 is 17364919819.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91891946371 - 2⁵ = 91891946339 is a prime.

It is not a weakly prime, because it can be changed into another prime (91891946071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45945973185 + 45945973186.

It is an arithmetic number, because the mean of its divisors is an integer number (45945973186).

Almost surely, 2^91891946371 is an apocalyptic number.

91891946371 is a deficient number, since it is larger than the sum of its proper divisors (1).

91891946371 is an equidigital number, since it uses as much as digits as its factorization.

91891946371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 58.

The spelling of 91891946371 in words is "ninety-one billion, eight hundred ninety-one million, nine hundred forty-six thousand, three hundred seventy-one".