311402134721 has 2 divisors, whose sum is σ = 311402134722. Its totient is φ = 311402134720.

The previous prime is 311402134717. The next prime is 311402134733. The reversal of 311402134721 is 127431204113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310516417600 + 885717121 = 557240^2 + 29761^2 .

It is a cyclic number.

It is not a de Polignac number, because 311402134721 - 2² = 311402134717 is a prime.

It is not a weakly prime, because it can be changed into another prime (311402131721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155701067360 + 155701067361.

It is an arithmetic number, because the mean of its divisors is an integer number (155701067361).

Almost surely, 2^311402134721 is an apocalyptic number.

It is an amenable number.

311402134721 is a deficient number, since it is larger than the sum of its proper divisors (1).

311402134721 is an equidigital number, since it uses as much as digits as its factorization.

311402134721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 311402134721 its reverse (127431204113), we get a palindrome (438833338834).

The spelling of 311402134721 in words is "three hundred eleven billion, four hundred two million, one hundred thirty-four thousand, seven hundred twenty-one".