311121122131 has 4 divisors (see below), whose sum is σ = 311545571872. Its totient is φ = 310696672392.

The previous prime is 311121122113. The next prime is 311121122203. The reversal of 311121122131 is 131221121113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311121122131 is a prime.

It is a super-2 number, since 2×311121122131² (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 = 311121122099 and 311121122108.

It is not an unprimeable number, because it can be changed into a prime (311121122101) 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, 212223771 + ... + 212225236.

It is an arithmetic number, because the mean of its divisors is an integer number (77886392968).

Almost surely, 2^311121122131 is an apocalyptic number.

311121122131 is a deficient number, since it is larger than the sum of its proper divisors (424449741).

311121122131 is an equidigital number, since it uses as much as digits as its factorization.

311121122131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424449740.

The product of its digits is 72, while the sum is 19.

Adding to 311121122131 its reverse (131221121113), we get a palindrome (442342243244).

The spelling of 311121122131 in words is "three hundred eleven billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred thirty-one".