91816 has 16 divisors (see below), whose sum is σ = 180000. Its totient is φ = 43824.

The previous prime is 91813. The next prime is 91823. The reversal of 91816 is 61819.

91816 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66 + ... + 433.

It is an arithmetic number, because the mean of its divisors is an integer number (11250).

2⁹¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

91816 is a deficient number, since it is larger than the sum of its proper divisors (88184).

91816 is a wasteful number, since it uses less digits than its factorization.

91816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 524 counting only the distinct ones).

The product of its digits is 432, while the sum is 25.

The square root of 91816 is about 303.0115509349. The cubic root of 91816 is about 45.1134585524.

The spelling of 91816 in words is "ninety-one thousand, eight hundred sixteen".