91716891 has 16 divisors (see below), whose sum is σ = 139910400. Its totient is φ = 52352928.

The previous prime is 91716883. The next prime is 91716907. The reversal of 91716891 is 19861719.

It is not a de Polignac number, because 91716891 - 2³ = 91716883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91716811) 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, 24705 + ... + 28173.

It is an arithmetic number, because the mean of its divisors is an integer number (8744400).

Almost surely, 2^91716891 is an apocalyptic number.

91716891 is a deficient number, since it is larger than the sum of its proper divisors (48193509).

91716891 is a wasteful number, since it uses less digits than its factorization.

91716891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738.

The product of its digits is 27216, while the sum is 42.

The square root of 91716891 is about 9576.8935986571. The cubic root of 91716891 is about 450.9722042577.

The spelling of 91716891 in words is "ninety-one million, seven hundred sixteen thousand, eight hundred ninety-one".