91911616 has 56 divisors (see below), whose sum is σ = 188092080. Its totient is φ = 44544000.

The previous prime is 91911581. The next prime is 91911629. The reversal of 91911616 is 61611919.

91911616 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

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, 381256 + ... + 381496.

Almost surely, 2^91911616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91911616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94046040).

91911616 is an abundant number, since it is smaller than the sum of its proper divisors (96180464).

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

91911616 is a wasteful number, since it uses less digits than its factorization.

91911616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 403 counting only the distinct ones).

The product of its digits is 2916, while the sum is 34.

The square root of 91911616 is about 9587.0546050390. The cubic root of 91911616 is about 451.2911331099.

The spelling of 91911616 in words is "ninety-one million, nine hundred eleven thousand, six hundred sixteen".