311421506729 has 2 divisors, whose sum is σ = 311421506730. Its totient is φ = 311421506728.

The previous prime is 311421506699. The next prime is 311421506741. The reversal of 311421506729 is 927605124113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217503775129 + 93917731600 = 466373^2 + 306460^2 .

It is a cyclic number.

It is not a de Polignac number, because 311421506729 - 2¹⁶ = 311421441193 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 (311421506749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155710753364 + 155710753365.

It is an arithmetic number, because the mean of its divisors is an integer number (155710753365).

Almost surely, 2^311421506729 is an apocalyptic number.

It is an amenable number.

311421506729 is a deficient number, since it is larger than the sum of its proper divisors (1).

311421506729 is an equidigital number, since it uses as much as digits as its factorization.

311421506729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 311421506729 in words is "three hundred eleven billion, four hundred twenty-one million, five hundred six thousand, seven hundred twenty-nine".