91240 has 16 divisors (see below), whose sum is σ = 205380. Its totient is φ = 36480.

The previous prime is 91237. The next prime is 91243. The reversal of 91240 is 4219.

It is an interprime number because it is at equal distance from previous prime (91237) and next prime (91243).

It can be written as a sum of positive squares in 2 ways, for example, as 91204 + 36 = 302^2 + 6^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101 + ... + 1180.

2⁹¹²⁴⁰ is an apocalyptic number.

It is an amenable number.

91240 is an abundant number, since it is smaller than the sum of its proper divisors (114140).

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 (102690).

91240 is a wasteful number, since it uses less digits than its factorization.

91240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292 (or 2288 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 91240 is about 302.0595967686. The cubic root of 91240 is about 45.0189220835.

Adding to 91240 its reverse (4219), we get a palindrome (95459).

The spelling of 91240 in words is "ninety-one thousand, two hundred forty".