91819047671 has 16 divisors (see below), whose sum is σ = 101629449600. Its totient is φ = 82464748704.

The previous prime is 91819047611. The next prime is 91819047679. The reversal of 91819047671 is 17674091819.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-91819047671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91819047679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 588770 + ... + 728208.

It is an arithmetic number, because the mean of its divisors is an integer number (6351840600).

Almost surely, 2^91819047671 is an apocalyptic number.

91819047671 is a deficient number, since it is larger than the sum of its proper divisors (9810401929).

91819047671 is an equidigital number, since it uses as much as digits as its factorization.

91819047671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139563 (or 139489 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 53.

The spelling of 91819047671 in words is "ninety-one billion, eight hundred nineteen million, forty-seven thousand, six hundred seventy-one".