33131213 has 4 divisors (see below), whose sum is σ = 33227040. Its totient is φ = 33035388.

The previous prime is 33131191. The next prime is 33131221. The reversal of 33131213 is 31213133.

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.

It is a cyclic number.

It is not a de Polignac number, because 33131213 - 2⁶ = 33131149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33131191 and 33131200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131233) 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, 47393 + ... + 48086.

It is an arithmetic number, because the mean of its divisors is an integer number (8306760).

Almost surely, 2^33131213 is an apocalyptic number.

It is an amenable number.

33131213 is a deficient number, since it is larger than the sum of its proper divisors (95827).

33131213 is an equidigital number, since it uses as much as digits as its factorization.

33131213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95826.

The product of its digits is 162, while the sum is 17.

The square root of 33131213 is about 5755.9719422527. The cubic root of 33131213 is about 321.1779922081.

Adding to 33131213 its reverse (31213133), we get a palindrome (64344346).

The spelling of 33131213 in words is "thirty-three million, one hundred thirty-one thousand, two hundred thirteen".