90331 has 4 divisors (see below), whose sum is σ = 91312. Its totient is φ = 89352.

The previous prime is 90313. The next prime is 90353. The reversal of 90331 is 13309.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 90331 - 2⁷ = 90203 is a prime.

It is a super-2 number, since 2×90331² = 16319379122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90371) 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, 336 + ... + 541.

It is an arithmetic number, because the mean of its divisors is an integer number (22828).

2⁹⁰³³¹ is an apocalyptic number.

90331 is a deficient number, since it is larger than the sum of its proper divisors (981).

90331 is a wasteful number, since it uses less digits than its factorization.

90331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980.

The product of its (nonzero) digits is 81, while the sum is 16.

The square root of 90331 is about 300.5511603704. The cubic root of 90331 is about 44.8689189547.

The spelling of 90331 in words is "ninety thousand, three hundred thirty-one".