331720633 has 2 divisors, whose sum is σ = 331720634. Its totient is φ = 331720632.

The previous prime is 331720607. The next prime is 331720673. The reversal of 331720633 is 336027133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 331130809 + 589824 = 18197^2 + 768^2 .

It is a cyclic number.

It is not a de Polignac number, because 331720633 - 2⁹ = 331720121 is a prime.

It is a super-2 number, since 2×331720633² = 220077156715841378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331720673) 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, 165860316 + 165860317.

It is an arithmetic number, because the mean of its divisors is an integer number (165860317).

Almost surely, 2^331720633 is an apocalyptic number.

It is an amenable number.

331720633 is a deficient number, since it is larger than the sum of its proper divisors (1).

331720633 is an equidigital number, since it uses as much as digits as its factorization.

331720633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 28.

The square root of 331720633 is about 18213.1994169064. The cubic root of 331720633 is about 692.2412822341.

Adding to 331720633 its reverse (336027133), we get a palindrome (667747766).

The spelling of 331720633 in words is "three hundred thirty-one million, seven hundred twenty thousand, six hundred thirty-three".