311118137797 has 2 divisors, whose sum is σ = 311118137798. Its totient is φ = 311118137796.

The previous prime is 311118137777. The next prime is 311118137849. The reversal of 311118137797 is 797731811113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308920309636 + 2197828161 = 555806^2 + 46881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311118137797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311118137797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311118137777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155559068898 + 155559068899.

It is an arithmetic number, because the mean of its divisors is an integer number (155559068899).

Almost surely, 2^311118137797 is an apocalyptic number.

It is an amenable number.

311118137797 is a deficient number, since it is larger than the sum of its proper divisors (1).

311118137797 is an equidigital number, since it uses as much as digits as its factorization.

311118137797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 49.

The spelling of 311118137797 in words is "three hundred eleven billion, one hundred eighteen million, one hundred thirty-seven thousand, seven hundred ninety-seven".