331685351321 has 2 divisors, whose sum is σ = 331685351322. Its totient is φ = 331685351320.

The previous prime is 331685351237. The next prime is 331685351339. The reversal of 331685351321 is 123153586133.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 330235264921 + 1450086400 = 574661^2 + 38080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331685351321 is a prime.

It is a super-2 number, since 2×331685351321² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331675351321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165842675660 + 165842675661.

It is an arithmetic number, because the mean of its divisors is an integer number (165842675661).

Almost surely, 2^331685351321 is an apocalyptic number.

It is an amenable number.

331685351321 is a deficient number, since it is larger than the sum of its proper divisors (1).

331685351321 is an equidigital number, since it uses as much as digits as its factorization.

331685351321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 41.

The spelling of 331685351321 in words is "three hundred thirty-one billion, six hundred eighty-five million, three hundred fifty-one thousand, three hundred twenty-one".