311610640681 has 4 divisors (see below), whose sum is σ = 321662596864. Its totient is φ = 301558684500.

The previous prime is 311610640667. The next prime is 311610640687. The reversal of 311610640681 is 186046016113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-311610640681 is a prime.

It is a super-2 number, since 2×311610640681² (a number of 24 digits) contains 22 as substring.

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 311610640681.

It is not an unprimeable number, because it can be changed into a prime (311610640687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5025978045 + ... + 5025978106.

It is an arithmetic number, because the mean of its divisors is an integer number (80415649216).

Almost surely, 2^311610640681 is an apocalyptic number.

311610640681 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

311610640681 is a deficient number, since it is larger than the sum of its proper divisors (10051956183).

311610640681 is a wasteful number, since it uses less digits than its factorization.

311610640681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10051956182.

The product of its (nonzero) digits is 20736, while the sum is 37.

Adding to 311610640681 its reverse (186046016113), we get a palindrome (497656656794).

The spelling of 311610640681 in words is "three hundred eleven billion, six hundred ten million, six hundred forty thousand, six hundred eighty-one".