331311320231 has 4 divisors (see below), whose sum is σ = 333920070912. Its totient is φ = 328702569552.

The previous prime is 331311320203. The next prime is 331311320239. The reversal of 331311320231 is 132023113133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132023113133 = 193 ⋅684057581.

It is a cyclic number.

It is not a de Polignac number, because 331311320231 - 2¹⁴ = 331311303847 is a prime.

It is a super-2 number, since 2×331311320231² (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 = 331311320197 and 331311320206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331311320239) 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, 1304375150 + ... + 1304375403.

It is an arithmetic number, because the mean of its divisors is an integer number (83480017728).

Almost surely, 2^331311320231 is an apocalyptic number.

331311320231 is a deficient number, since it is larger than the sum of its proper divisors (2608750681).

331311320231 is a wasteful number, since it uses less digits than its factorization.

331311320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2608750680.

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

Adding to 331311320231 its reverse (132023113133), we get a palindrome (463334433364).

The spelling of 331311320231 in words is "three hundred thirty-one billion, three hundred eleven million, three hundred twenty thousand, two hundred thirty-one".