801662909 has 2 divisors, whose sum is σ = 801662910. Its totient is φ = 801662908.

The previous prime is 801662903. The next prime is 801662929. The reversal of 801662909 is 909266108.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 584188900 + 217474009 = 24170^2 + 14747^2 .

It is a cyclic number.

It is not a de Polignac number, because 801662909 - 2⁴ = 801662893 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (801662903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400831454 + 400831455.

It is an arithmetic number, because the mean of its divisors is an integer number (400831455).

Almost surely, 2^801662909 is an apocalyptic number.

It is an amenable number.

801662909 is a deficient number, since it is larger than the sum of its proper divisors (1).

801662909 is an equidigital number, since it uses as much as digits as its factorization.

801662909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 801662909 is about 28313.6523429952. The cubic root of 801662909 is about 928.9605332226.

The spelling of 801662909 in words is "eight hundred one million, six hundred sixty-two thousand, nine hundred nine".