331220313131 has 2 divisors, whose sum is σ = 331220313132. Its totient is φ = 331220313130.

The previous prime is 331220313107. The next prime is 331220313187. The reversal of 331220313131 is 131313022133.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331220313131 is a prime.

It is a super-2 number, since 2×331220313131² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331220313097 and 331220313106.

It is not a weakly prime, because it can be changed into another prime (331220313631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165610156565 + 165610156566.

It is an arithmetic number, because the mean of its divisors is an integer number (165610156566).

Almost surely, 2^331220313131 is an apocalyptic number.

331220313131 is a deficient number, since it is larger than the sum of its proper divisors (1).

331220313131 is an equidigital number, since it uses as much as digits as its factorization.

331220313131 is an evil number, because the sum of its binary digits is even.

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

Adding to 331220313131 its reverse (131313022133), we get a palindrome (462533335264).

The spelling of 331220313131 in words is "three hundred thirty-one billion, two hundred twenty million, three hundred thirteen thousand, one hundred thirty-one".