31165 has 8 divisors (see below), whose sum is σ = 39168. Its totient is φ = 23760.

The previous prime is 31159. The next prime is 31177. The reversal of 31165 is 56113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31165 - 2¹³ = 22973 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9 and base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21 + ... + 250.

It is an arithmetic number, because the mean of its divisors is an integer number (4896).

2³¹¹⁶⁵ is an apocalyptic number.

It is an amenable number.

31165 is a deficient number, since it is larger than the sum of its proper divisors (8003).

31165 is a wasteful number, since it uses less digits than its factorization.

31165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299.

The product of its digits is 90, while the sum is 16.

The square root of 31165 is about 176.5361152852. The cubic root of 31165 is about 31.4694421049.

Adding to 31165 its reverse (56113), we get a palindrome (87278).

It can be divided in two parts, 31 and 165, that multiplied together give a palindrome (5115).

The spelling of 31165 in words is "thirty-one thousand, one hundred sixty-five".