91561132136 has 16 divisors (see below), whose sum is σ = 171697611840. Its totient is φ = 45775102320.

The previous prime is 91561132121. The next prime is 91561132139. The reversal of 91561132136 is 63123116519.

It is a self number, because there is not a number n which added to its sum of digits gives 91561132136.

It is not an unprimeable number, because it can be changed into a prime (91561132139) 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 3 ways as a sum of consecutive naturals, for example, 611306 + ... + 746201.

It is an arithmetic number, because the mean of its divisors is an integer number (10731100740).

Almost surely, 2^91561132136 is an apocalyptic number.

It is an amenable number.

91561132136 is a deficient number, since it is larger than the sum of its proper divisors (80136479704).

91561132136 is a wasteful number, since it uses less digits than its factorization.

91561132136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1365944 (or 1365940 counting only the distinct ones).

The product of its digits is 29160, while the sum is 38.

The spelling of 91561132136 in words is "ninety-one billion, five hundred sixty-one million, one hundred thirty-two thousand, one hundred thirty-six".