133031213 has 4 divisors (see below), whose sum is σ = 152035680. Its totient is φ = 114026748.

The previous prime is 133031203. The next prime is 133031221. The reversal of 133031213 is 312130331.

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 an emirpimes, since its reverse is a distinct semiprime: 312130331 = 2851 ⋅109481.

It is a cyclic number.

It is not a de Polignac number, because 133031213 - 2⁸ = 133030957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133031191 and 133031200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133031203) 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, 9502223 + ... + 9502236.

It is an arithmetic number, because the mean of its divisors is an integer number (38008920).

Almost surely, 2^133031213 is an apocalyptic number.

It is an amenable number.

133031213 is a deficient number, since it is larger than the sum of its proper divisors (19004467).

133031213 is an equidigital number, since it uses as much as digits as its factorization.

133031213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19004466.

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

The square root of 133031213 is about 11533.9157704571. The cubic root of 133031213 is about 510.4868003505.

Adding to 133031213 its reverse (312130331), we get a palindrome (445161544).

The spelling of 133031213 in words is "one hundred thirty-three million, thirty-one thousand, two hundred thirteen".