331130312321 has 4 divisors (see below), whose sum is σ = 339206661444. Its totient is φ = 323053963200.

The previous prime is 331130312281. The next prime is 331130312329. The reversal of 331130312321 is 123213031133.

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 34175068225 + 296955244096 = 184865^2 + 544936^2 .

It is a cyclic number.

It is not a de Polignac number, because 331130312321 - 2¹⁸ = 331130050177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331130312329) 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, 4038174500 + ... + 4038174581.

It is an arithmetic number, because the mean of its divisors is an integer number (84801665361).

Almost surely, 2^331130312321 is an apocalyptic number.

It is an amenable number.

331130312321 is a deficient number, since it is larger than the sum of its proper divisors (8076349123).

331130312321 is an equidigital number, since it uses as much as digits as its factorization.

331130312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8076349122.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 331130312321 its reverse (123213031133), we get a palindrome (454343343454).

The spelling of 331130312321 in words is "three hundred thirty-one billion, one hundred thirty million, three hundred twelve thousand, three hundred twenty-one".