91969931018 has 32 divisors (see below), whose sum is σ = 159753216000. Its totient is φ = 38893658544.

The previous prime is 91969931017. The next prime is 91969931051. The reversal of 91969931018 is 81013996919.

It is a super-3 number, since 3×91969931018³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (91969931017) 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 15 ways as a sum of consecutive naturals, for example, 1908383 + ... + 1955981.

It is an arithmetic number, because the mean of its divisors is an integer number (4992288000).

Almost surely, 2^91969931018 is an apocalyptic number.

91969931018 is a deficient number, since it is larger than the sum of its proper divisors (67783284982).

91969931018 is a wasteful number, since it uses less digits than its factorization.

91969931018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49434.

The product of its (nonzero) digits is 944784, while the sum is 56.

The spelling of 91969931018 in words is "ninety-one billion, nine hundred sixty-nine million, nine hundred thirty-one thousand, eighteen".