80785009 has 2 divisors, whose sum is σ = 80785010. Its totient is φ = 80785008.

The previous prime is 80784973. The next prime is 80785013. The reversal of 80785009 is 90058708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76387600 + 4397409 = 8740^2 + 2097^2 .

It is a cyclic number.

It is not a de Polignac number, because 80785009 - 2⁹ = 80784497 is a prime.

It is not a weakly prime, because it can be changed into another prime (80785079) 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, 40392504 + 40392505.

It is an arithmetic number, because the mean of its divisors is an integer number (40392505).

Almost surely, 2^80785009 is an apocalyptic number.

It is an amenable number.

80785009 is a deficient number, since it is larger than the sum of its proper divisors (1).

80785009 is an equidigital number, since it uses as much as digits as its factorization.

80785009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 80785009 is about 8988.0481195864. The cubic root of 80785009 is about 432.2917286064.

The spelling of 80785009 in words is "eighty million, seven hundred eighty-five thousand, nine".