91017991933 has 8 divisors (see below), whose sum is σ = 99297508320. Its totient is φ = 82739334480.

The previous prime is 91017991919. The next prime is 91017991997. The reversal of 91017991933 is 33919971019.

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

It is not a de Polignac number, because 91017991933 - 2⁵ = 91017991901 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 (91017991733) 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 7 ways as a sum of consecutive naturals, for example, 17791 + ... + 427027.

It is an arithmetic number, because the mean of its divisors is an integer number (12412188540).

Almost surely, 2^91017991933 is an apocalyptic number.

It is an amenable number.

91017991933 is a deficient number, since it is larger than the sum of its proper divisors (8279516387).

91017991933 is a wasteful number, since it uses less digits than its factorization.

91017991933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429467.

The product of its (nonzero) digits is 413343, while the sum is 52.

The spelling of 91017991933 in words is "ninety-one billion, seventeen million, nine hundred ninety-one thousand, nine hundred thirty-three".