91798531945 has 8 divisors (see below), whose sum is σ = 110161888200. Its totient is φ = 73436392320.

The previous prime is 91798531921. The next prime is 91798531961. The reversal of 91798531945 is 54913589719.

It can be written as a sum of positive squares in 4 ways, for example, as 11035712601 + 80762819344 = 105051^2 + 284188^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91798531945 - 2⁷ = 91798531817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128986 + ... + 447475.

It is an arithmetic number, because the mean of its divisors is an integer number (13770236025).

Almost surely, 2^91798531945 is an apocalyptic number.

It is an amenable number.

91798531945 is a deficient number, since it is larger than the sum of its proper divisors (18363356255).

91798531945 is a wasteful number, since it uses less digits than its factorization.

91798531945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608315.

The product of its digits is 12247200, while the sum is 61.

The spelling of 91798531945 in words is "ninety-one billion, seven hundred ninety-eight million, five hundred thirty-one thousand, nine hundred forty-five".