91361570859 has 54 divisors (see below), whose sum is σ = 145465049340. Its totient is φ = 55214804736.

The previous prime is 91361570849. The next prime is 91361570863. The reversal of 91361570859 is 95807516319.

91361570859 is a `hidden beast` number, since 9 + 1 + 3 + 61 + 570 + 8 + 5 + 9 = 666.

It is not a de Polignac number, because 91361570859 - 2⁸ = 91361570603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91361570849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 90546147 + ... + 90547155.

It is an arithmetic number, because the mean of its divisors is an integer number (2693797210).

Almost surely, 2^91361570859 is an apocalyptic number.

91361570859 is a deficient number, since it is larger than the sum of its proper divisors (54103478481).

91361570859 is a wasteful number, since it uses less digits than its factorization.

91361570859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109 (or 1084 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 91361570859 in words is "ninety-one billion, three hundred sixty-one million, five hundred seventy thousand, eight hundred fifty-nine".