91513973646 has 48 divisors (see below), whose sum is σ = 204739936128. Its totient is φ = 29511475200.

The previous prime is 91513973609. The next prime is 91513973671. The reversal of 91513973646 is 64637931519.

91513973646 is a `hidden beast` number, since 9 + 1 + 513 + 97 + 36 + 4 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 91513973592 and 91513973601.

It is a congruent number.

It is an unprimeable number.

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, 1905286 + ... + 1952726.

It is an arithmetic number, because the mean of its divisors is an integer number (4265415336).

Almost surely, 2^91513973646 is an apocalyptic number.

91513973646 is an abundant number, since it is smaller than the sum of its proper divisors (113225962482).

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

91513973646 is a wasteful number, since it uses less digits than its factorization.

91513973646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50937 (or 50934 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The spelling of 91513973646 in words is "ninety-one billion, five hundred thirteen million, nine hundred seventy-three thousand, six hundred forty-six".