3161 has 4 divisors (see below), whose sum is σ = 3300.
Its totient is φ = 3024.
The previous prime is 3137. The next prime is 3163. The reversal of 3161 is 1613.
Adding to 3161 its reverse (1613), we get a palindrome (4774).
It can be divided in two parts, 31 and 61, that multiplied together give a triangular number (1891 = T61).
3161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
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 1936 + 1225 = 44^2 + 35^2
It is a cyclic number.
It is not a de Polignac number, because 3161 - 210 = 2137 is a prime.
It is a pancake number, because a pancake can be divided into 3161 parts by 79 straight cuts.
It is a Duffinian number.
It is a Curzon number.
It is a plaindrome in base 6.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (3163) 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, 26 + ... + 83.
It is an arithmetic number, because the mean of its divisors is an integer number (825).
23161 is an apocalyptic number.
It is an amenable number.
3161 is a deficient number, since it is larger than the sum of its proper divisors (139).
3161 is a wasteful number, since it uses less digits than its factorization.
3161 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 138.
The product of its digits is 18, while the sum is 11.
The square root of 3161 is about 56.2227711875.
Note that the first 3 decimals coincide.
The cubic root of 3161 is about 14.6760156189.
The spelling of 3161 in words is "three thousand, one hundred sixty-one".