91949141891 has 8 divisors (see below), whose sum is σ = 96630400944. Its totient is φ = 87383469600.

The previous prime is 91949141839. The next prime is 91949141909. The reversal of 91949141891 is 19814194919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91949141891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91949141821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28895060 + ... + 28898241.

It is an arithmetic number, because the mean of its divisors is an integer number (12078800118).

Almost surely, 2^91949141891 is an apocalyptic number.

91949141891 is a deficient number, since it is larger than the sum of its proper divisors (4681259053).

91949141891 is a wasteful number, since it uses less digits than its factorization.

91949141891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57793381.

The product of its digits is 839808, while the sum is 56.

The spelling of 91949141891 in words is "ninety-one billion, nine hundred forty-nine million, one hundred forty-one thousand, eight hundred ninety-one".