91197508698 has 12 divisors (see below), whose sum is σ = 197594602218. Its totient is φ = 30399169560.

The previous prime is 91197508669. The next prime is 91197508709. The reversal of 91197508698 is 89680579119.

91197508698 is a `hidden beast` number, since 9 + 119 + 7 + 508 + 6 + 9 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68480085969 + 22717422729 = 261687^2 + 150723^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2533264113 + ... + 2533264148.

Almost surely, 2^91197508698 is an apocalyptic number.

91197508698 is an abundant number, since it is smaller than the sum of its proper divisors (106397093520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91197508698 is a wasteful number, since it uses less digits than its factorization.

91197508698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066528269 (or 5066528266 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 63.

The spelling of 91197508698 in words is "ninety-one billion, one hundred ninety-seven million, five hundred eight thousand, six hundred ninety-eight".