312031232321 has 4 divisors (see below), whose sum is σ = 312032505732. Its totient is φ = 312029958912.

The previous prime is 312031232309. The next prime is 312031232329. The reversal of 312031232321 is 123232130213.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 123232130213 = 5483 ⋅22475311.

It can be written as a sum of positive squares in 2 ways, for example, as 230769748225 + 81261484096 = 480385^2 + 285064^2 .

It is a cyclic number.

It is not a de Polignac number, because 312031232321 - 2¹⁰ = 312031231297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312031232329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139976 + ... + 802281.

It is an arithmetic number, because the mean of its divisors is an integer number (78008126433).

Almost surely, 2^312031232321 is an apocalyptic number.

It is an amenable number.

312031232321 is a deficient number, since it is larger than the sum of its proper divisors (1273411).

312031232321 is an equidigital number, since it uses as much as digits as its factorization.

312031232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273410.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 312031232321 its reverse (123232130213), we get a palindrome (435263362534).

The spelling of 312031232321 in words is "three hundred twelve billion, thirty-one million, two hundred thirty-two thousand, three hundred twenty-one".