3611 has 4 divisors (see below), whose sum is σ = 3792. Its totient is φ = 3432.

The previous prime is 3607. The next prime is 3613. The reversal of 3611 is 1163.

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 3611 - 2² = 3607 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7 and base 14.

It is a junction number, because it is equal to n+sod(n) for n = 3592 and 3601.

It is not an unprimeable number, because it can be changed into a prime (3613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56 + ... + 101.

It is an arithmetic number, because the mean of its divisors is an integer number (948).

2³⁶¹¹ is an apocalyptic number.

3611 is a deficient number, since it is larger than the sum of its proper divisors (181).

3611 is a wasteful number, since it uses less digits than its factorization.

3611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180.

The product of its digits is 18, while the sum is 11.

The square root of 3611 is about 60.0915967503. The cubic root of 3611 is about 15.3417827827.

Subtracting from 3611 its sum of digits (11), we obtain a square (3600 = 60²).

Adding to 3611 its reverse (1163), we get a palindrome (4774).

The spelling of 3611 in words is "three thousand, six hundred eleven".