91116571 has 32 divisors (see below), whose sum is σ = 119168000. Its totient is φ = 67651200.

The previous prime is 91116569. The next prime is 91116587. The reversal of 91116571 is 17561119.

It is a cyclic number.

It is not a de Polignac number, because 91116571 - 2¹ = 91116569 is a prime.

It is the 9546-th Hogben number.

It is not an unprimeable number, because it can be changed into a prime (91116551) by changing a digit.

It is a nontrivial repunit in base 9545.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260905 + ... + 261253.

It is an arithmetic number, because the mean of its divisors is an integer number (3724000).

Almost surely, 2^91116571 is an apocalyptic number.

91116571 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

91116571 is a deficient number, since it is larger than the sum of its proper divisors (28051429).

91116571 is a wasteful number, since it uses less digits than its factorization.

91116571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539.

The product of its digits is 1890, while the sum is 31.

The square root of 91116571 is about 9545.5000392855. The cubic root of 91116571 is about 449.9861246751.

The spelling of 91116571 in words is "ninety-one million, one hundred sixteen thousand, five hundred seventy-one".