331311641 has 2 divisors, whose sum is σ = 331311642. Its totient is φ = 331311640.

The previous prime is 331311577. The next prime is 331311709. The reversal of 331311641 is 146113133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234702400 + 96609241 = 15320^2 + 9829^2 .

It is a cyclic number.

It is not a de Polignac number, because 331311641 - 2⁶ = 331311577 is a prime.

It is a super-2 number, since 2×331311641² = 219534806924225762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331311241) 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, 165655820 + 165655821.

It is an arithmetic number, because the mean of its divisors is an integer number (165655821).

Almost surely, 2^331311641 is an apocalyptic number.

It is an amenable number.

331311641 is a deficient number, since it is larger than the sum of its proper divisors (1).

331311641 is an equidigital number, since it uses as much as digits as its factorization.

331311641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 331311641 is about 18201.9680529332. The cubic root of 331311641 is about 691.9566676565.

Adding to 331311641 its reverse (146113133), we get a palindrome (477424774).

The spelling of 331311641 in words is "three hundred thirty-one million, three hundred eleven thousand, six hundred forty-one".