91111897 has 16 divisors (see below), whose sum is σ = 98576640. Its totient is φ = 83939328.

The previous prime is 91111877. The next prime is 91111903. The reversal of 91111897 is 79811119.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91111897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91111877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229303 + ... + 229699.

It is an arithmetic number, because the mean of its divisors is an integer number (6161040).

Almost surely, 2^91111897 is an apocalyptic number.

It is an amenable number.

91111897 is a deficient number, since it is larger than the sum of its proper divisors (7464743).

91111897 is a wasteful number, since it uses less digits than its factorization.

91111897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720.

The product of its digits is 4536, while the sum is 37.

The square root of 91111897 is about 9545.2552087411. The cubic root of 91111897 is about 449.9784302418.

The spelling of 91111897 in words is "ninety-one million, one hundred eleven thousand, eight hundred ninety-seven".