31118 has 4 divisors (see below), whose sum is σ = 46680. Its totient is φ = 15558.

The previous prime is 31091. The next prime is 31121. The reversal of 31118 is 81113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81113 = 29 ⋅2797.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7778 + ... + 7781.

It is an arithmetic number, because the mean of its divisors is an integer number (11670).

2³¹¹¹⁸ is an apocalyptic number.

31118 is a deficient number, since it is larger than the sum of its proper divisors (15562).

31118 is a wasteful number, since it uses less digits than its factorization.

31118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15561.

The product of its digits is 24, while the sum is 14.

The square root of 31118 is about 176.4029478212. The cubic root of 31118 is about 31.4536144358.

The spelling of 31118 in words is "thirty-one thousand, one hundred eighteen".