91290 has 32 divisors (see below), whose sum is σ = 233280. Its totient is φ = 22784.

The previous prime is 91283. The next prime is 91291. The reversal of 91290 is 9219.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91291) by changing a digit.

91290 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 15 ways as a sum of consecutive naturals, for example, 421 + ... + 599.

It is an arithmetic number, because the mean of its divisors is an integer number (7290).

2⁹¹²⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116640).

91290 is an abundant number, since it is smaller than the sum of its proper divisors (141990).

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

91290 is a wasteful number, since it uses less digits than its factorization.

91290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 91290 is about 302.1423505568. The cubic root of 91290 is about 45.0271441171.

The spelling of 91290 in words is "ninety-one thousand, two hundred ninety".