311686431377 has 2 divisors, whose sum is σ = 311686431378. Its totient is φ = 311686431376.

The previous prime is 311686431367. The next prime is 311686431401. The reversal of 311686431377 is 773134686113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225761820736 + 85924610641 = 475144^2 + 293129^2 .

It is a cyclic number.

It is not a de Polignac number, because 311686431377 - 2¹⁰ = 311686430353 is a prime.

It is a super-2 number, since 2×311686431377² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311686431367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155843215688 + 155843215689.

It is an arithmetic number, because the mean of its divisors is an integer number (155843215689).

Almost surely, 2^311686431377 is an apocalyptic number.

It is an amenable number.

311686431377 is a deficient number, since it is larger than the sum of its proper divisors (1).

311686431377 is an equidigital number, since it uses as much as digits as its factorization.

311686431377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 50.

The spelling of 311686431377 in words is "three hundred eleven billion, six hundred eighty-six million, four hundred thirty-one thousand, three hundred seventy-seven".