90591 has 4 divisors (see below), whose sum is σ = 120792. Its totient is φ = 60392.

The previous prime is 90583. The next prime is 90599. The reversal of 90591 is 19509.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (90583) and next prime (90599).

It is a cyclic number.

It is not a de Polignac number, because 90591 - 2³ = 90583 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 90591.

It is not an unprimeable number, because it can be changed into a prime (90599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15096 + ... + 15101.

It is an arithmetic number, because the mean of its divisors is an integer number (30198).

2⁹⁰⁵⁹¹ is an apocalyptic number.

90591 is a deficient number, since it is larger than the sum of its proper divisors (30201).

90591 is a wasteful number, since it uses less digits than its factorization.

90591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30200.

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 90591 is about 300.9833882459. The cubic root of 90591 is about 44.9119265014.

The spelling of 90591 in words is "ninety thousand, five hundred ninety-one".