8611 has 4 divisors (see below), whose sum is σ = 8800.
Its totient is φ = 8424.
The previous prime is 8609. The next prime is 8623. The reversal of 8611 is 1168.
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 8611 - 21 = 8609 is a prime.
It is a Duffinian number.
8611 is a lucky number.
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (8641) 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, 25 + ... + 133.
It is an arithmetic number, because the mean of its divisors is an integer number (2200).
8611 is the 42-nd centered decagonal number.
8611 is a deficient number, since it is larger than the sum of its proper divisors (189).
8611 is a wasteful number, since it uses less digits than its factorization.
8611 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 188.
The product of its digits is 48, while the sum is 16.
The square root of 8611 is about 92.7954740276.
The cubic root of 8611 is about 20.4967276157.
Adding to 8611 its reverse (1168), we get a palindrome (9779).
It can be divided in two parts, 86 and 11, that multiplied together give a triangular number (946 = T43).
The spelling of 8611 in words is "eight thousand, six hundred eleven".