31089 has 8 divisors (see below), whose sum is σ = 42592. Its totient is φ = 20160.

The previous prime is 31081. The next prime is 31091. The reversal of 31089 is 98013.

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

It is not a de Polignac number, because 31089 - 2³ = 31081 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31081) 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, 9 + ... + 249.

It is an arithmetic number, because the mean of its divisors is an integer number (5324).

2³¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

31089 is a deficient number, since it is larger than the sum of its proper divisors (11503).

31089 is a wasteful number, since it uses less digits than its factorization.

31089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 31089 is about 176.3207304885. The cubic root of 31089 is about 31.4438404751.

It can be divided in two parts, 3108 and 9, that multiplied together give a palindrome (27972).

The spelling of 31089 in words is "thirty-one thousand, eighty-nine".