1205605673 has 2 divisors, whose sum is σ = 1205605674. Its totient is φ = 1205605672.

The previous prime is 1205605553. The next prime is 1205605679. The reversal of 1205605673 is 3765065021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069813264 + 135792409 = 32708^2 + 11653^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205605673 - 2⁸ = 1205605417 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 (1205605679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602802836 + 602802837.

It is an arithmetic number, because the mean of its divisors is an integer number (602802837).

Almost surely, 2^1205605673 is an apocalyptic number.

It is an amenable number.

1205605673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205605673 is an equidigital number, since it uses as much as digits as its factorization.

1205605673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 1205605673 is about 34721.8328001274. The cubic root of 1205605673 is about 1064.3106982786.

The spelling of 1205605673 in words is "one billion, two hundred five million, six hundred five thousand, six hundred seventy-three".