445550309 has 2 divisors, whose sum is σ = 445550310. Its totient is φ = 445550308.

The previous prime is 445550291. The next prime is 445550341. The reversal of 445550309 is 903055544.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396129409 + 49420900 = 19903^2 + 7030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445550309 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445550009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222775154 + 222775155.

It is an arithmetic number, because the mean of its divisors is an integer number (222775155).

Almost surely, 2^445550309 is an apocalyptic number.

It is an amenable number.

445550309 is a deficient number, since it is larger than the sum of its proper divisors (1).

445550309 is an equidigital number, since it uses as much as digits as its factorization.

445550309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 445550309 is about 21108.0626538771. The cubic root of 445550309 is about 763.7752535796.

The spelling of 445550309 in words is "four hundred forty-five million, five hundred fifty thousand, three hundred nine".