31606 has 4 divisors (see below), whose sum is σ = 47412. Its totient is φ = 15802.

The previous prime is 31601. The next prime is 31607. The reversal of 31606 is 60613.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31601) by changing a digit.

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 as a sum of consecutive naturals, namely, 7900 + ... + 7903.

It is an arithmetic number, because the mean of its divisors is an integer number (11853).

2³¹⁶⁰⁶ is an apocalyptic number.

31606 is a deficient number, since it is larger than the sum of its proper divisors (15806).

31606 is a wasteful number, since it uses less digits than its factorization.

31606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15805.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 31606 is about 177.7807638638. The cubic root of 31606 is about 31.6171834119.

The spelling of 31606 in words is "thirty-one thousand, six hundred six".