133231213 has 4 divisors (see below), whose sum is σ = 133254720. Its totient is φ = 133207708.

The previous prime is 133231207. The next prime is 133231223. The reversal of 133231213 is 312132331.

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 a de Polignac number, because none of the positive numbers 2^k-133231213 is a prime.

It is a super-2 number, since 2×133231213² = 35501112234902738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133231223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2556 + ... + 16522.

It is an arithmetic number, because the mean of its divisors is an integer number (33313680).

Almost surely, 2^133231213 is an apocalyptic number.

It is an amenable number.

133231213 is a deficient number, since it is larger than the sum of its proper divisors (23507).

133231213 is an equidigital number, since it uses as much as digits as its factorization.

133231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23506.

The product of its digits is 324, while the sum is 19.

The square root of 133231213 is about 11542.5825966289. The cubic root of 133231213 is about 510.7424953258.

Adding to 133231213 its reverse (312132331), we get a palindrome (445363544).

The spelling of 133231213 in words is "one hundred thirty-three million, two hundred thirty-one thousand, two hundred thirteen".