311321320031 has 4 divisors (see below), whose sum is σ = 317945177952. Its totient is φ = 304697462112.

The previous prime is 311321320001. The next prime is 311321320043. The reversal of 311321320031 is 130023123113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311321320031 - 2²⁶ = 311254211167 is a prime.

It is a super-2 number, since 2×311321320031² (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 = 311321319985 and 311321320012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311321320001) 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, 3311928890 + ... + 3311928983.

It is an arithmetic number, because the mean of its divisors is an integer number (79486294488).

Almost surely, 2^311321320031 is an apocalyptic number.

311321320031 is a deficient number, since it is larger than the sum of its proper divisors (6623857921).

311321320031 is an equidigital number, since it uses as much as digits as its factorization.

311321320031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6623857920.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 311321320031 its reverse (130023123113), we get a palindrome (441344443144).

The spelling of 311321320031 in words is "three hundred eleven billion, three hundred twenty-one million, three hundred twenty thousand, thirty-one".