91993878297 has 24 divisors (see below), whose sum is σ = 138690512064. Its totient is φ = 58648771104.

The previous prime is 91993878283. The next prime is 91993878307. The reversal of 91993878297 is 79287839919.

It is not a de Polignac number, because 91993878297 - 2⁴ = 91993878281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91993878497) 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, 854398 + ... + 956024.

It is an arithmetic number, because the mean of its divisors is an integer number (5778771336).

Almost surely, 2^91993878297 is an apocalyptic number.

It is an amenable number.

91993878297 is a deficient number, since it is larger than the sum of its proper divisors (46696633767).

91993878297 is a wasteful number, since it uses less digits than its factorization.

91993878297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106029 (or 106026 counting only the distinct ones).

The product of its digits is 123451776, while the sum is 72.

The spelling of 91993878297 in words is "ninety-one billion, nine hundred ninety-three million, eight hundred seventy-eight thousand, two hundred ninety-seven".