91800508361 has 4 divisors (see below), whose sum is σ = 91829498112. Its totient is φ = 91771518612.

The previous prime is 91800508307. The next prime is 91800508379. The reversal of 91800508361 is 16380500819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16380500819 = 89 ⋅184050571.

It is a cyclic number.

It is not a de Polignac number, because 91800508361 - 2²⁶ = 91733399497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91806508361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14490125 + ... + 14496458.

It is an arithmetic number, because the mean of its divisors is an integer number (22957374528).

Almost surely, 2^91800508361 is an apocalyptic number.

It is an amenable number.

91800508361 is a deficient number, since it is larger than the sum of its proper divisors (28989751).

91800508361 is a wasteful number, since it uses less digits than its factorization.

91800508361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28989750.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 91800508361 in words is "ninety-one billion, eight hundred million, five hundred eight thousand, three hundred sixty-one".