808009621 has 2 divisors, whose sum is σ = 808009622. Its totient is φ = 808009620.

The previous prime is 808009583. The next prime is 808009649. The reversal of 808009621 is 126900808.

808009621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443734225 + 364275396 = 21065^2 + 19086^2 .

It is a cyclic number.

It is not a de Polignac number, because 808009621 - 2¹⁵ = 807976853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808009681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404004810 + 404004811.

It is an arithmetic number, because the mean of its divisors is an integer number (404004811).

Almost surely, 2^808009621 is an apocalyptic number.

It is an amenable number.

808009621 is a deficient number, since it is larger than the sum of its proper divisors (1).

808009621 is an equidigital number, since it uses as much as digits as its factorization.

808009621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 808009621 is about 28425.5100393995. The cubic root of 808009621 is about 931.4055983356.

The spelling of 808009621 in words is "eight hundred eight million, nine thousand, six hundred twenty-one".