311431120421 has 2 divisors, whose sum is σ = 311431120422. Its totient is φ = 311431120420.

The previous prime is 311431120393. The next prime is 311431120447. The reversal of 311431120421 is 124021134113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261033115396 + 50398005025 = 510914^2 + 224495^2 .

It is a cyclic number.

It is not a de Polignac number, because 311431120421 - 2²⁶ = 311364011557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311431120621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155715560210 + 155715560211.

It is an arithmetic number, because the mean of its divisors is an integer number (155715560211).

Almost surely, 2^311431120421 is an apocalyptic number.

It is an amenable number.

311431120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

311431120421 is an equidigital number, since it uses as much as digits as its factorization.

311431120421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 311431120421 its reverse (124021134113), we get a palindrome (435452254534).

The spelling of 311431120421 in words is "three hundred eleven billion, four hundred thirty-one million, one hundred twenty thousand, four hundred twenty-one".