90291 has 4 divisors (see below), whose sum is σ = 120392. Its totient is φ = 60192.

The previous prime is 90289. The next prime is 90313. The reversal of 90291 is 19209.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90291 - 2¹ = 90289 is a prime.

It is a D-number.

It is a Duffinian number.

90291 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 90291.

It is not an unprimeable number, because it can be changed into a prime (90271) 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, 15046 + ... + 15051.

It is an arithmetic number, because the mean of its divisors is an integer number (30098).

2⁹⁰²⁹¹ is an apocalyptic number.

90291 is a deficient number, since it is larger than the sum of its proper divisors (30101).

90291 is a wasteful number, since it uses less digits than its factorization.

90291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30100.

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

The square root of 90291 is about 300.4846085909. The cubic root of 90291 is about 44.8622950872.

The spelling of 90291 in words is "ninety thousand, two hundred ninety-one".