31133 has 4 divisors (see below), whose sum is σ = 31488. Its totient is φ = 30780.

The previous prime is 31123. The next prime is 31139. The reversal of 31133 is 33113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31133 - 2⁶ = 31069 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31139) 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, 68 + ... + 258.

It is an arithmetic number, because the mean of its divisors is an integer number (7872).

2³¹¹³³ is an apocalyptic number.

It is an amenable number.

31133 is a deficient number, since it is larger than the sum of its proper divisors (355).

31133 is a wasteful number, since it uses less digits than its factorization.

31133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354.

The product of its digits is 27, while the sum is 11.

The square root of 31133 is about 176.4454589951. The cubic root of 31133 is about 31.4586675500.

Adding to 31133 its reverse (33113), we get a palindrome (64246).

It can be divided in two parts, 3113 and 3, that multiplied together give a palindrome (9339).

The spelling of 31133 in words is "thirty-one thousand, one hundred thirty-three".