31115 has 12 divisors (see below), whose sum is σ = 43776. Its totient is φ = 21168.

The previous prime is 31091. The next prime is 31121. The reversal of 31115 is 51113.

It is not a de Polignac number, because 31115 - 2⁶ = 31051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31096 and 31105.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182 + ... + 308.

It is an arithmetic number, because the mean of its divisors is an integer number (3648).

2³¹¹¹⁵ is an apocalyptic number.

31115 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31115 is a deficient number, since it is larger than the sum of its proper divisors (12661).

31115 is a wasteful number, since it uses less digits than its factorization.

31115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 139 counting only the distinct ones).

The product of its digits is 15, while the sum is 11.

The square root of 31115 is about 176.3944443570. The cubic root of 31115 is about 31.4526036181.

Adding to 31115 its reverse (51113), we get a palindrome (82228).

The spelling of 31115 in words is "thirty-one thousand, one hundred fifteen".