91197595971 has 24 divisors (see below), whose sum is σ = 134371174080. Its totient is φ = 59590567296.

The previous prime is 91197595919. The next prime is 91197595999. The reversal of 91197595971 is 17959579119.

It is not a de Polignac number, because 91197595971 - 2⁷ = 91197595843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91197595899 and 91197595908.

It is not an unprimeable number, because it can be changed into a prime (91197595571) 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 23 ways as a sum of consecutive naturals, for example, 370720 + ... + 565533.

It is an arithmetic number, because the mean of its divisors is an integer number (5598798920).

Almost surely, 2^91197595971 is an apocalyptic number.

91197595971 is a deficient number, since it is larger than the sum of its proper divisors (43173578109).

91197595971 is a wasteful number, since it uses less digits than its factorization.

91197595971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936475 (or 936472 counting only the distinct ones).

The product of its digits is 8037225, while the sum is 63.

The spelling of 91197595971 in words is "ninety-one billion, one hundred ninety-seven million, five hundred ninety-five thousand, nine hundred seventy-one".