331909317643 has 2 divisors, whose sum is σ = 331909317644. Its totient is φ = 331909317642.

The previous prime is 331909317617. The next prime is 331909317647. The reversal of 331909317643 is 346713909133.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 331909317643 - 2¹⁷ = 331909186571 is a prime.

It is a super-2 number, since 2×331909317643² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331909317647) 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 as a sum of consecutive naturals, namely, 165954658821 + 165954658822.

It is an arithmetic number, because the mean of its divisors is an integer number (165954658822).

Almost surely, 2^331909317643 is an apocalyptic number.

331909317643 is a deficient number, since it is larger than the sum of its proper divisors (1).

331909317643 is an equidigital number, since it uses as much as digits as its factorization.

331909317643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 49.

The spelling of 331909317643 in words is "three hundred thirty-one billion, nine hundred nine million, three hundred seventeen thousand, six hundred forty-three".