4312331321 has 2 divisors, whose sum is σ = 4312331322. Its totient is φ = 4312331320.

The previous prime is 4312331293. The next prime is 4312331339. The reversal of 4312331321 is 1231332134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4217073721 + 95257600 = 64939^2 + 9760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4312331321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4312331381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2156165660 + 2156165661.

It is an arithmetic number, because the mean of its divisors is an integer number (2156165661).

Almost surely, 2^4312331321 is an apocalyptic number.

It is an amenable number.

4312331321 is a deficient number, since it is larger than the sum of its proper divisors (1).

4312331321 is an equidigital number, since it uses as much as digits as its factorization.

4312331321 is an evil number, because the sum of its binary digits is even.

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

The square root of 4312331321 is about 65668.3433703029. The cubic root of 4312331321 is about 1627.6862955700.

Adding to 4312331321 its reverse (1231332134), we get a palindrome (5543663455).

The spelling of 4312331321 in words is "four billion, three hundred twelve million, three hundred thirty-one thousand, three hundred twenty-one".