331011312131 has 4 divisors (see below), whose sum is σ = 331646651064. Its totient is φ = 330375973200.

The previous prime is 331011312109. The next prime is 331011312139. The reversal of 331011312131 is 131213110133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131213110133 = 7 ⋅18744730019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331011312131 is a prime.

It is a super-2 number, since 2×331011312131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331011312139) 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, 317668685 + ... + 317669726.

It is an arithmetic number, because the mean of its divisors is an integer number (82911662766).

Almost surely, 2^331011312131 is an apocalyptic number.

331011312131 is a deficient number, since it is larger than the sum of its proper divisors (635338933).

331011312131 is an equidigital number, since it uses as much as digits as its factorization.

331011312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635338932.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 331011312131 its reverse (131213110133), we get a palindrome (462224422264).

The spelling of 331011312131 in words is "three hundred thirty-one billion, eleven million, three hundred twelve thousand, one hundred thirty-one".