91081181092 has 24 divisors (see below), whose sum is σ = 174603778272. Its totient is φ = 41228745600.

The previous prime is 91081181089. The next prime is 91081181117. The reversal of 91081181092 is 29018118019.

It is a super-2 number, since 2×91081181092² (a number of 23 digits) contains 22 as substring.

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, 4284058 + ... + 4305265.

It is an arithmetic number, because the mean of its divisors is an integer number (7275157428).

Almost surely, 2^91081181092 is an apocalyptic number.

It is an amenable number.

91081181092 is a deficient number, since it is larger than the sum of its proper divisors (83522597180).

91081181092 is a wasteful number, since it uses less digits than its factorization.

91081181092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8589579 (or 8589577 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 40.

The spelling of 91081181092 in words is "ninety-one billion, eighty-one million, one hundred eighty-one thousand, ninety-two".