31885 has 8 divisors (see below), whose sum is σ = 43776. Its totient is φ = 21840.

The previous prime is 31883. The next prime is 31891. The reversal of 31885 is 58813.

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

It is not a de Polignac number, because 31885 - 2¹ = 31883 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421 + ... + 490.

It is an arithmetic number, because the mean of its divisors is an integer number (5472).

2³¹⁸⁸⁵ is an apocalyptic number.

31885 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31885 is a deficient number, since it is larger than the sum of its proper divisors (11891).

31885 is an equidigital number, since it uses as much as digits as its factorization.

31885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923.

The product of its digits is 960, while the sum is 25.

The square root of 31885 is about 178.5637141191. The cubic root of 31885 is about 31.7099439061.

The spelling of 31885 in words is "thirty-one thousand, eight hundred eighty-five".