331244009 has 2 divisors, whose sum is σ = 331244010. Its totient is φ = 331244008.

The previous prime is 331243987. The next prime is 331244033. The reversal of 331244009 is 900442133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250747225 + 80496784 = 15835^2 + 8972^2 .

It is a cyclic number.

It is not a de Polignac number, because 331244009 - 2⁸ = 331243753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (331244059) 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, 165622004 + 165622005.

It is an arithmetic number, because the mean of its divisors is an integer number (165622005).

Almost surely, 2^331244009 is an apocalyptic number.

It is an amenable number.

331244009 is a deficient number, since it is larger than the sum of its proper divisors (1).

331244009 is an equidigital number, since it uses as much as digits as its factorization.

331244009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 331244009 is about 18200.1101370294. The cubic root of 331244009 is about 691.9095804710.

The spelling of 331244009 in words is "three hundred thirty-one million, two hundred forty-four thousand, nine".