31303 has 4 divisors (see below), whose sum is σ = 32688. Its totient is φ = 29920.

The previous prime is 31277. The next prime is 31307. The reversal of 31303 is 30313.

It is a happy number.

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 31303 - 2⁵ = 31271 is a prime.

It is a Duffinian number.

31303 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 31303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31307) 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, 658 + ... + 703.

It is an arithmetic number, because the mean of its divisors is an integer number (8172).

2³¹³⁰³ is an apocalyptic number.

31303 is a deficient number, since it is larger than the sum of its proper divisors (1385).

31303 is a wasteful number, since it uses less digits than its factorization.

31303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384.

The product of its (nonzero) digits is 27, while the sum is 10.

The square root of 31303 is about 176.9265384277. The cubic root of 31303 is about 31.5158230742.

Adding to 31303 its sum of digits (10), we get a palindrome (31313).

Adding to 31303 its reverse (30313), we get a palindrome (61616).

Subtracting from 31303 its reverse (30313), we obtain a triangular number (990 = T₄₄).

The spelling of 31303 in words is "thirty-one thousand, three hundred three".