331240312121 has 2 divisors, whose sum is σ = 331240312122. Its totient is φ = 331240312120.

The previous prime is 331240312093. The next prime is 331240312127. The reversal of 331240312121 is 121213042133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 282747427600 + 48492884521 = 531740^2 + 220211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331240312121 is a prime.

It is not a weakly prime, because it can be changed into another prime (331240312127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165620156060 + 165620156061.

It is an arithmetic number, because the mean of its divisors is an integer number (165620156061).

Almost surely, 2^331240312121 is an apocalyptic number.

It is an amenable number.

331240312121 is a deficient number, since it is larger than the sum of its proper divisors (1).

331240312121 is an equidigital number, since it uses as much as digits as its factorization.

331240312121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 331240312121 its reverse (121213042133), we get a palindrome (452453354254).

The spelling of 331240312121 in words is "three hundred thirty-one billion, two hundred forty million, three hundred twelve thousand, one hundred twenty-one".