311703172321 has 2 divisors, whose sum is σ = 311703172322. Its totient is φ = 311703172320.

The previous prime is 311703172303. The next prime is 311703172357. The reversal of 311703172321 is 123271307113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230101536721 + 81601635600 = 479689^2 + 285660^2 .

It is a cyclic number.

It is not a de Polignac number, because 311703172321 - 2⁹ = 311703171809 is a prime.

It is not a weakly prime, because it can be changed into another prime (311703172301) 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 as a sum of consecutive naturals, namely, 155851586160 + 155851586161.

It is an arithmetic number, because the mean of its divisors is an integer number (155851586161).

Almost surely, 2^311703172321 is an apocalyptic number.

It is an amenable number.

311703172321 is a deficient number, since it is larger than the sum of its proper divisors (1).

311703172321 is an equidigital number, since it uses as much as digits as its factorization.

311703172321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

Adding to 311703172321 its reverse (123271307113), we get a palindrome (434974479434).

The spelling of 311703172321 in words is "three hundred eleven billion, seven hundred three million, one hundred seventy-two thousand, three hundred twenty-one".