31103 has 4 divisors (see below), whose sum is σ = 32760. Its totient is φ = 29448.

The previous prime is 31091. The next prime is 31121. The reversal of 31103 is 30113.

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

It is a cyclic number.

It is not a de Polignac number, because 31103 - 2⁶ = 31039 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6 and base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31103.

It is not an unprimeable number, because it can be changed into a prime (31123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 837.

It is an arithmetic number, because the mean of its divisors is an integer number (8190).

2³¹¹⁰³ is an apocalyptic number.

31103 is a deficient number, since it is larger than the sum of its proper divisors (1657).

31103 is a wasteful number, since it uses less digits than its factorization.

31103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656.

The product of its (nonzero) digits is 9, while the sum is 8.

The square root of 31103 is about 176.3604264000. The cubic root of 31103 is about 31.4485596974.

Adding to 31103 its reverse (30113), we get a palindrome (61216).

Subtracting from 31103 its reverse (30113), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 3110 and 3, that added together give a palindrome (3113).

The spelling of 31103 in words is "thirty-one thousand, one hundred three".