800168821 has 4 divisors (see below), whose sum is σ = 803211552. Its totient is φ = 797126092.

The previous prime is 800168779. The next prime is 800168861. The reversal of 800168821 is 128861008.

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.

It is a cyclic number.

It is not a de Polignac number, because 800168821 - 2⁷ = 800168693 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 (800168861) 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 in 3 ways as a sum of consecutive naturals, for example, 1520971 + ... + 1521496.

It is an arithmetic number, because the mean of its divisors is an integer number (200802888).

Almost surely, 2^800168821 is an apocalyptic number.

It is an amenable number.

800168821 is a deficient number, since it is larger than the sum of its proper divisors (3042731).

800168821 is a wasteful number, since it uses less digits than its factorization.

800168821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042730.

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 800168821 is about 28287.2554518815. The cubic root of 800168821 is about 928.3830619355.

The spelling of 800168821 in words is "eight hundred million, one hundred sixty-eight thousand, eight hundred twenty-one".