1205705647 has 2 divisors, whose sum is σ = 1205705648. Its totient is φ = 1205705646.

The previous prime is 1205705623. The next prime is 1205705659. The reversal of 1205705647 is 7465075021.

It is a strong prime.

It is an emirp because it is prime and its reverse (7465075021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1205705647 - 2⁷ = 1205705519 is a prime.

It is a super-2 number, since 2×1205705647² = 2907452214415377218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205705447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602852823 + 602852824.

It is an arithmetic number, because the mean of its divisors is an integer number (602852824).

Almost surely, 2^1205705647 is an apocalyptic number.

1205705647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205705647 is an equidigital number, since it uses as much as digits as its factorization.

1205705647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 1205705647 is about 34723.2724120294. The cubic root of 1205705647 is about 1064.3401165368.

The spelling of 1205705647 in words is "one billion, two hundred five million, seven hundred five thousand, six hundred forty-seven".