1646008729 has 2 divisors, whose sum is σ = 1646008730. Its totient is φ = 1646008728.

The previous prime is 1646008711. The next prime is 1646008733. The reversal of 1646008729 is 9278006461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1345055625 + 300953104 = 36675^2 + 17348^2 .

It is a cyclic number.

It is not a de Polignac number, because 1646008729 - 2¹⁹ = 1645484441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1646003729) 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, 823004364 + 823004365.

It is an arithmetic number, because the mean of its divisors is an integer number (823004365).

Almost surely, 2^1646008729 is an apocalyptic number.

It is an amenable number.

1646008729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646008729 is an equidigital number, since it uses as much as digits as its factorization.

1646008729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1646008729 is about 40571.0331270970. The cubic root of 1646008729 is about 1180.7121835516.

The spelling of 1646008729 in words is "one billion, six hundred forty-six million, eight thousand, seven hundred twenty-nine".