91550 has 12 divisors (see below), whose sum is σ = 170376. Its totient is φ = 36600.

The previous prime is 91541. The next prime is 91571. The reversal of 91550 is 5519.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

91550 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 866 + ... + 965.

It is an arithmetic number, because the mean of its divisors is an integer number (14198).

2⁹¹⁵⁵⁰ is an apocalyptic number.

91550 is a deficient number, since it is larger than the sum of its proper divisors (78826).

91550 is a wasteful number, since it uses less digits than its factorization.

91550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843 (or 1838 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 91550 is about 302.5723054081. The cubic root of 91550 is about 45.0698503678.

The spelling of 91550 in words is "ninety-one thousand, five hundred fifty".