311625338197 has 2 divisors, whose sum is σ = 311625338198. Its totient is φ = 311625338196.

The previous prime is 311625338179. The next prime is 311625338249. The reversal of 311625338197 is 791833526113.

Together with previous prime (311625338179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254748335076 + 56877003121 = 504726^2 + 238489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311625338197 is a prime.

It is a super-2 number, since 2×311625338197² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 311625338197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311625338797) 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, 155812669098 + 155812669099.

It is an arithmetic number, because the mean of its divisors is an integer number (155812669099).

Almost surely, 2^311625338197 is an apocalyptic number.

It is an amenable number.

311625338197 is a deficient number, since it is larger than the sum of its proper divisors (1).

311625338197 is an equidigital number, since it uses as much as digits as its factorization.

311625338197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The spelling of 311625338197 in words is "three hundred eleven billion, six hundred twenty-five million, three hundred thirty-eight thousand, one hundred ninety-seven".