312311221133 has 4 divisors (see below), whose sum is σ = 313472229660. Its totient is φ = 311150212608.

The previous prime is 312311221121. The next prime is 312311221139. The reversal of 312311221133 is 331122113213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32170727044 + 280140494089 = 179362^2 + 529283^2 .

It is a cyclic number.

It is not a de Polignac number, because 312311221133 - 2⁸ = 312311220877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 312311221099 and 312311221108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312311221139) 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, 580503860 + ... + 580504397.

It is an arithmetic number, because the mean of its divisors is an integer number (78368057415).

Almost surely, 2^312311221133 is an apocalyptic number.

It is an amenable number.

312311221133 is a deficient number, since it is larger than the sum of its proper divisors (1161008527).

312311221133 is a wasteful number, since it uses less digits than its factorization.

312311221133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161008526.

The product of its digits is 648, while the sum is 23.

Adding to 312311221133 its reverse (331122113213), we get a palindrome (643433334346).

The spelling of 312311221133 in words is "three hundred twelve billion, three hundred eleven million, two hundred twenty-one thousand, one hundred thirty-three".