91280775497 has 8 divisors (see below), whose sum is σ = 91930657920. Its totient is φ = 90631490400.

The previous prime is 91280775491. The next prime is 91280775527. The reversal of 91280775497 is 79457708219.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91280775497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91280775491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159653 + ... + 456125.

It is an arithmetic number, because the mean of its divisors is an integer number (11491332240).

Almost surely, 2^91280775497 is an apocalyptic number.

It is an amenable number.

91280775497 is a deficient number, since it is larger than the sum of its proper divisors (649882423).

91280775497 is a wasteful number, since it uses less digits than its factorization.

91280775497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298663.

The product of its (nonzero) digits is 8890560, while the sum is 59.

The spelling of 91280775497 in words is "ninety-one billion, two hundred eighty million, seven hundred seventy-five thousand, four hundred ninety-seven".