57691 has 4 divisors (see below), whose sum is σ = 59584. Its totient is φ = 55800.
The previous prime is 57689. The next prime is 57697. The reversal of 57691 is 19675.
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 57691 - 21 = 57689 is a prime.
It is a Duffinian number.
57691 is a lucky number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (57697) 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, 900 + ... + 961.
It is an arithmetic number, because the mean of its divisors is an integer number (14896).
257691 is an apocalyptic number.
57691 is a deficient number, since it is larger than the sum of its proper divisors (1893).
57691 is a wasteful number, since it uses less digits than its factorization.
57691 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1892.
The product of its digits is 1890, while the sum is 28.
The square root of 57691 is about 240.1895085136. The cubic root of 57691 is about 38.6399025384.
The spelling of 57691 in words is "fifty-seven thousand, six hundred ninety-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.069 sec. • engine limits •