801628609 has 2 divisors, whose sum is σ = 801628610. Its totient is φ = 801628608.

The previous prime is 801628589. The next prime is 801628673. The reversal of 801628609 is 906826108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481934209 + 319694400 = 21953^2 + 17880^2 .

It is a cyclic number.

It is not a de Polignac number, because 801628609 - 2⁹ = 801628097 is a prime.

It is not a weakly prime, because it can be changed into another prime (801628109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400814304 + 400814305.

It is an arithmetic number, because the mean of its divisors is an integer number (400814305).

Almost surely, 2^801628609 is an apocalyptic number.

It is an amenable number.

801628609 is a deficient number, since it is larger than the sum of its proper divisors (1).

801628609 is an equidigital number, since it uses as much as digits as its factorization.

801628609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 801628609 is about 28313.0466216548. The cubic root of 801628609 is about 928.9472841789.

The spelling of 801628609 in words is "eight hundred one million, six hundred twenty-eight thousand, six hundred nine".