31161 has 16 divisors (see below), whose sum is σ = 48384. Its totient is φ = 17664.

The previous prime is 31159. The next prime is 31177. The reversal of 31161 is 16113.

It is not a de Polignac number, because 31161 - 2¹ = 31159 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640 + ... + 686.

It is an arithmetic number, because the mean of its divisors is an integer number (3024).

2³¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

31161 is a deficient number, since it is larger than the sum of its proper divisors (17223).

31161 is a wasteful number, since it uses less digits than its factorization.

31161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80.

The product of its digits is 18, while the sum is 12.

The square root of 31161 is about 176.5247857951. The cubic root of 31161 is about 31.4680956890.

Adding to 31161 its reverse (16113), we get a palindrome (47274).

The spelling of 31161 in words is "thirty-one thousand, one hundred sixty-one".