331231013 has 4 divisors (see below), whose sum is σ = 331290060. Its totient is φ = 331171968.

The previous prime is 331231007. The next prime is 331231031. The reversal of 331231013 is 310132133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310132133 = 6101 ⋅50833.

It can be written as a sum of positive squares in 2 ways, for example, as 228674884 + 102556129 = 15122^2 + 10127^2 .

It is a cyclic number.

It is not a de Polignac number, because 331231013 - 2⁴ = 331230997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331230982 and 331231000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331231093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20108 + ... + 32661.

It is an arithmetic number, because the mean of its divisors is an integer number (82822515).

Almost surely, 2^331231013 is an apocalyptic number.

It is an amenable number.

331231013 is a deficient number, since it is larger than the sum of its proper divisors (59047).

331231013 is an equidigital number, since it uses as much as digits as its factorization.

331231013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59046.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 331231013 is about 18199.7531027209. The cubic root of 331231013 is about 691.9005315783.

Adding to 331231013 its reverse (310132133), we get a palindrome (641363146).

The spelling of 331231013 in words is "three hundred thirty-one million, two hundred thirty-one thousand, thirteen".