311311213123 has 4 divisors (see below), whose sum is σ = 312786621928. Its totient is φ = 309835804320.

The previous prime is 311311213121. The next prime is 311311213141. The reversal of 311311213123 is 321312113113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321312113113 = 17443 ⋅18420691.

It is a cyclic number.

It is not a de Polignac number, because 311311213123 - 2¹ = 311311213121 is a prime.

It is a super-2 number, since 2×311311213123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311311213094 and 311311213103.

It is not an unprimeable number, because it can be changed into a prime (311311213121) 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, 737704086 + ... + 737704507.

It is an arithmetic number, because the mean of its divisors is an integer number (78196655482).

Almost surely, 2^311311213123 is an apocalyptic number.

311311213123 is a deficient number, since it is larger than the sum of its proper divisors (1475408805).

311311213123 is a wasteful number, since it uses less digits than its factorization.

311311213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1475408804.

The product of its digits is 324, while the sum is 22.

Adding to 311311213123 its reverse (321312113113), we get a palindrome (632623326236).

The spelling of 311311213123 in words is "three hundred eleven billion, three hundred eleven million, two hundred thirteen thousand, one hundred twenty-three".