57091 has 4 divisors (see below), whose sum is σ = 58672.
Its totient is φ = 55512.
The previous prime is 57089. The next prime is 57097. The reversal of 57091 is 19075.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 57091 - 21 = 57089 is a prime.
It is a Duffinian number.
It is a zygodrome in base 3.
It is not an unprimeable number, because it can be changed into a prime (57097) 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, 735 + ... + 808.
It is an arithmetic number, because the mean of its divisors is an integer number (14668).
257091 is an apocalyptic number.
57091 is a deficient number, since it is larger than the sum of its proper divisors (1581).
57091 is a wasteful number, since it uses less digits than its factorization.
57091 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1580.
The product of its (nonzero) digits is 315, while the sum is 22.
The square root of 57091 is about 238.9372302510.
The cubic root of 57091 is about 38.5054807512.
The spelling of 57091 in words is "fifty-seven thousand, ninety-one".