311688377861 has 16 divisors (see below), whose sum is σ = 365247995904. Its totient is φ = 260412458544.

The previous prime is 311688377857. The next prime is 311688377867. The reversal of 311688377861 is 168773886113.

It is a happy number.

It is not a de Polignac number, because 311688377861 - 2² = 311688377857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311688377861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311688377867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 916565 + ... + 1209738.

It is an arithmetic number, because the mean of its divisors is an integer number (22827999744).

Almost surely, 2^311688377861 is an apocalyptic number.

It is an amenable number.

311688377861 is a deficient number, since it is larger than the sum of its proper divisors (53559618043).

311688377861 is a wasteful number, since it uses less digits than its factorization.

311688377861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126840.

The product of its digits is 8128512, while the sum is 59.

The spelling of 311688377861 in words is "three hundred eleven billion, six hundred eighty-eight million, three hundred seventy-seven thousand, eight hundred sixty-one".