1331224409 has 2 divisors, whose sum is σ = 1331224410. Its totient is φ = 1331224408.

The previous prime is 1331224399. The next prime is 1331224421. The reversal of 1331224409 is 9044221331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 836829184 + 494395225 = 28928^2 + 22235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331224409 - 2⁴ = 1331224393 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 (1331224459) 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, 665612204 + 665612205.

It is an arithmetic number, because the mean of its divisors is an integer number (665612205).

Almost surely, 2^1331224409 is an apocalyptic number.

It is an amenable number.

1331224409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331224409 is an equidigital number, since it uses as much as digits as its factorization.

1331224409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1331224409 is about 36485.9481033452. The cubic root of 1331224409 is about 1100.0618171871.

The spelling of 1331224409 in words is "one billion, three hundred thirty-one million, two hundred twenty-four thousand, four hundred nine".