91581727604 has 12 divisors (see below), whose sum is σ = 161194429284. Its totient is φ = 45526176384.

The previous prime is 91581727591. The next prime is 91581727607. The reversal of 91581727604 is 40672718519.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 89369906704 + 2211820900 = 298948^2 + 47030^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91581727607) 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 3 ways as a sum of consecutive naturals, for example, 66171077 + ... + 66172460.

It is an arithmetic number, because the mean of its divisors is an integer number (13432869107).

Almost surely, 2^91581727604 is an apocalyptic number.

It is an amenable number.

91581727604 is a deficient number, since it is larger than the sum of its proper divisors (69612701680).

91581727604 is a wasteful number, since it uses less digits than its factorization.

91581727604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132343714 (or 132343712 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 91581727604 in words is "ninety-one billion, five hundred eighty-one million, seven hundred twenty-seven thousand, six hundred four".