91170 has 24 divisors (see below), whose sum is σ = 237276. Its totient is φ = 24288.

The previous prime is 91163. The next prime is 91183. The reversal of 91170 is 7119.

It can be written as a sum of positive squares in 2 ways, for example, as 74529 + 16641 = 273^2 + 129^2 .

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417 + ... + 596.

2⁹¹¹⁷⁰ is an apocalyptic number.

91170 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

91170 is an abundant number, since it is smaller than the sum of its proper divisors (146106).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118638).

91170 is a wasteful number, since it uses less digits than its factorization.

91170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 1023 counting only the distinct ones).

The product of its (nonzero) digits is 63, while the sum is 18.

The square root of 91170 is about 301.9437033621. The cubic root of 91170 is about 45.0074061884.

Adding to 91170 its reverse (7119), we get a palindrome (98289).

The spelling of 91170 in words is "ninety-one thousand, one hundred seventy".