91081128 has 32 divisors (see below), whose sum is σ = 228081600. Its totient is φ = 30309888.

The previous prime is 91081099. The next prime is 91081147. The reversal of 91081128 is 82118019.

It is a junction number, because it is equal to n+sod(n) for n = 91081095 and 91081104.

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, 13333 + ... + 18971.

It is an arithmetic number, because the mean of its divisors is an integer number (7127550).

Almost surely, 2^91081128 is an apocalyptic number.

It is an amenable number.

91081128 is an abundant number, since it is smaller than the sum of its proper divisors (137000472).

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

91081128 is a wasteful number, since it uses less digits than its factorization.

91081128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6321 (or 6317 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 91081128 is about 9543.6433294628. The cubic root of 91081128 is about 449.9277711233.

The spelling of 91081128 in words is "ninety-one million, eighty-one thousand, one hundred twenty-eight".