6161 has 4 divisors (see below), whose sum is σ = 6324. Its totient is φ = 6000.

The previous prime is 6151. The next prime is 6163. The reversal of 6161 is 1616.

6161 = 55² + 56².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3025 + 3136 = 55^2 + 56^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6161 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

6161 is an undulating number in base 10.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6163) 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, 11 + ... + 111.

It is an arithmetic number, because the mean of its divisors is an integer number (1581).

6161 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6161 is the 56-th centered square number.

It is an amenable number.

6161 is a deficient number, since it is larger than the sum of its proper divisors (163).

6161 is a wasteful number, since it uses less digits than its factorization.

6161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162.

The product of its digits is 36, while the sum is 14.

The square root of 6161 is about 78.4920378128. The cubic root of 6161 is about 18.3323048091.

Adding to 6161 its reverse (1616), we get a palindrome (7777).

The spelling of 6161 in words is "six thousand, one hundred sixty-one".