609944021 has 2 divisors, whose sum is σ = 609944022. Its totient is φ = 609944020.

The previous prime is 609944017. The next prime is 609944033. The reversal of 609944021 is 120449906.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486423025 + 123520996 = 22055^2 + 11114^2 .

It is a cyclic number.

It is not a de Polignac number, because 609944021 - 2² = 609944017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609944221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304972010 + 304972011.

It is an arithmetic number, because the mean of its divisors is an integer number (304972011).

Almost surely, 2^609944021 is an apocalyptic number.

It is an amenable number.

609944021 is a deficient number, since it is larger than the sum of its proper divisors (1).

609944021 is an equidigital number, since it uses as much as digits as its factorization.

609944021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 609944021 is about 24697.0447827265. The cubic root of 609944021 is about 848.0666652267.

The spelling of 609944021 in words is "six hundred nine million, nine hundred forty-four thousand, twenty-one".