91971959676 has 24 divisors (see below), whose sum is σ = 214631795280. Its totient is φ = 30652954752.

The previous prime is 91971959671. The next prime is 91971959687. The reversal of 91971959676 is 67695917919.

It is a super-3 number, since 3×91971959676³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91971959676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91971959671) 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 7 ways as a sum of consecutive naturals, for example, 457281 + ... + 626936.

It is an arithmetic number, because the mean of its divisors is an integer number (8942991470).

Almost surely, 2^91971959676 is an apocalyptic number.

It is an amenable number.

91971959676 is an abundant number, since it is smaller than the sum of its proper divisors (122659835604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91971959676 is a wasteful number, since it uses less digits than its factorization.

91971959676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091293 (or 1091291 counting only the distinct ones).

The product of its digits is 57868020, while the sum is 69.

The spelling of 91971959676 in words is "ninety-one billion, nine hundred seventy-one million, nine hundred fifty-nine thousand, six hundred seventy-six".