331631645381 has 2 divisors, whose sum is σ = 331631645382. Its totient is φ = 331631645380.

The previous prime is 331631645357. The next prime is 331631645437. The reversal of 331631645381 is 183546136133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 307591142881 + 24040502500 = 554609^2 + 155050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331631645381 is a prime.

It is a super-2 number, since 2×331631645381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331631645311) 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 as a sum of consecutive naturals, namely, 165815822690 + 165815822691.

It is an arithmetic number, because the mean of its divisors is an integer number (165815822691).

Almost surely, 2^331631645381 is an apocalyptic number.

It is an amenable number.

331631645381 is a deficient number, since it is larger than the sum of its proper divisors (1).

331631645381 is an equidigital number, since it uses as much as digits as its factorization.

331631645381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 44.

The spelling of 331631645381 in words is "three hundred thirty-one billion, six hundred thirty-one million, six hundred forty-five thousand, three hundred eighty-one".