808649621 has 6 divisors (see below), whose sum is σ = 875638530. Its totient is φ = 746445648.

The previous prime is 808649587. The next prime is 808649641. The reversal of 808649621 is 126946808.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 34975396 + 773674225 = 5914^2 + 27815^2 .

It is a de Polignac number, because none of the positive numbers 2^k-808649621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808649641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2392286 + ... + 2392623.

It is an arithmetic number, because the mean of its divisors is an integer number (145939755).

Almost surely, 2^808649621 is an apocalyptic number.

It is an amenable number.

808649621 is a deficient number, since it is larger than the sum of its proper divisors (66988909).

808649621 is a wasteful number, since it uses less digits than its factorization.

808649621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4784935 (or 4784922 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 808649621 is about 28436.7653047951. The cubic root of 808649621 is about 931.6514461788.

The spelling of 808649621 in words is "eight hundred eight million, six hundred forty-nine thousand, six hundred twenty-one".