311213032331 has 4 divisors (see below), whose sum is σ = 311226942600. Its totient is φ = 311199122064.

The previous prime is 311213032327. The next prime is 311213032343. The reversal of 311213032331 is 133230312113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133230312113 = 79 ⋅1686459647.

It is a cyclic number.

It is not a de Polignac number, because 311213032331 - 2² = 311213032327 is a prime.

It is a super-2 number, since 2×311213032331² (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 = 311213032297 and 311213032306.

It is not an unprimeable number, because it can be changed into a prime (311213032631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6921521 + ... + 6966338.

It is an arithmetic number, because the mean of its divisors is an integer number (77806735650).

Almost surely, 2^311213032331 is an apocalyptic number.

311213032331 is a deficient number, since it is larger than the sum of its proper divisors (13910269).

311213032331 is a wasteful number, since it uses less digits than its factorization.

311213032331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13910268.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 311213032331 its reverse (133230312113), we get a palindrome (444443344444).

The spelling of 311213032331 in words is "three hundred eleven billion, two hundred thirteen million, thirty-two thousand, three hundred thirty-one".