91813589545 has 16 divisors (see below), whose sum is σ = 120420407808. Its totient is φ = 66900222720.

The previous prime is 91813589533. The next prime is 91813589597. The reversal of 91813589545 is 54598531819.

It is a happy number.

It is not a de Polignac number, because 91813589545 - 2⁵ = 91813589513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91813589545.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17419299 + ... + 17424568.

It is an arithmetic number, because the mean of its divisors is an integer number (7526275488).

Almost surely, 2^91813589545 is an apocalyptic number.

It is an amenable number.

91813589545 is a deficient number, since it is larger than the sum of its proper divisors (28606818263).

91813589545 is a wasteful number, since it uses less digits than its factorization.

91813589545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34843920.

The product of its digits is 7776000, while the sum is 58.

The spelling of 91813589545 in words is "ninety-one billion, eight hundred thirteen million, five hundred eighty-nine thousand, five hundred forty-five".