312133213331 has 4 divisors (see below), whose sum is σ = 312197062200. Its totient is φ = 312069364464.

The previous prime is 312133213319. The next prime is 312133213349. The reversal of 312133213331 is 133312331213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312133213331 is a prime.

It is a super-2 number, since 2×312133213331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312133213331.

It is not an unprimeable number, because it can be changed into a prime (312133213391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31917101 + ... + 31926878.

It is an arithmetic number, because the mean of its divisors is an integer number (78049265550).

Almost surely, 2^312133213331 is an apocalyptic number.

312133213331 is a deficient number, since it is larger than the sum of its proper divisors (63848869).

312133213331 is an equidigital number, since it uses as much as digits as its factorization.

312133213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63848868.

The product of its digits is 2916, while the sum is 26.

Adding to 312133213331 its reverse (133312331213), we get a palindrome (445445544544).

The spelling of 312133213331 in words is "three hundred twelve billion, one hundred thirty-three million, two hundred thirteen thousand, three hundred thirty-one".