91494816671 has 4 divisors (see below), whose sum is σ = 93967649592. Its totient is φ = 89021983752.

The previous prime is 91494816667. The next prime is 91494816683. The reversal of 91494816671 is 17661849419.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91494816671 - 2² = 91494816667 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 (91494816631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1236416405 + ... + 1236416478.

It is an arithmetic number, because the mean of its divisors is an integer number (23491912398).

Almost surely, 2^91494816671 is an apocalyptic number.

91494816671 is a deficient number, since it is larger than the sum of its proper divisors (2472832921).

91494816671 is a wasteful number, since it uses less digits than its factorization.

91494816671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2472832920.

The product of its digits is 2612736, while the sum is 56.

The spelling of 91494816671 in words is "ninety-one billion, four hundred ninety-four million, eight hundred sixteen thousand, six hundred seventy-one".