312133213 has 4 divisors (see below), whose sum is σ = 356723680. Its totient is φ = 267542748.

The previous prime is 312133201. The next prime is 312133223. The reversal of 312133213 is 312331213.

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-312133213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312133223) 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, 22295223 + ... + 22295236.

It is an arithmetic number, because the mean of its divisors is an integer number (89180920).

Almost surely, 2^312133213 is an apocalyptic number.

It is an amenable number.

312133213 is a deficient number, since it is larger than the sum of its proper divisors (44590467).

312133213 is an equidigital number, since it uses as much as digits as its factorization.

312133213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44590466.

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

The square root of 312133213 is about 17667.2921807503. The cubic root of 312133213 is about 678.3388033829.

Adding to 312133213 its reverse (312331213), we get a palindrome (624464426).

The spelling of 312133213 in words is "three hundred twelve million, one hundred thirty-three thousand, two hundred thirteen".