809062021 has 4 divisors (see below), whose sum is σ = 809121600. Its totient is φ = 809002444.

The previous prime is 809062019. The next prime is 809062031. The reversal of 809062021 is 120260908.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 809062021 - 2¹ = 809062019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809062031) 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 in 3 ways as a sum of consecutive naturals, for example, 1620 + ... + 40258.

It is an arithmetic number, because the mean of its divisors is an integer number (202280400).

Almost surely, 2^809062021 is an apocalyptic number.

It is an amenable number.

809062021 is a deficient number, since it is larger than the sum of its proper divisors (59579).

809062021 is a wasteful number, since it uses less digits than its factorization.

809062021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59578.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 809062021 is about 28444.0155568794. The cubic root of 809062021 is about 931.8097956669.

The spelling of 809062021 in words is "eight hundred nine million, sixty-two thousand, twenty-one".