55091 has 4 divisors (see below), whose sum is σ = 55800. Its totient is φ = 54384.

The previous prime is 55079. The next prime is 55103. The reversal of 55091 is 19055.

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 (55079) and next prime (55103).

It is a cyclic number.

It is not a de Polignac number, because 55091 - 2¹⁴ = 38707 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (55001) 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, 221 + ... + 398.

It is an arithmetic number, because the mean of its divisors is an integer number (13950).

2⁵⁵⁰⁹¹ is an apocalyptic number.

55091 is a deficient number, since it is larger than the sum of its proper divisors (709).

55091 is an equidigital number, since it uses as much as digits as its factorization.

55091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708.

The product of its (nonzero) digits is 225, while the sum is 20.

The square root of 55091 is about 234.7147204587. The cubic root of 55091 is about 38.0504869099.

The spelling of 55091 in words is "fifty-five thousand, ninety-one".