800519521 has 4 divisors (see below), whose sum is σ = 803495700. Its totient is φ = 797543344.

The previous prime is 800519507. The next prime is 800519527. The reversal of 800519521 is 125915008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 359519521 + 441000000 = 18961^2 + 21000^2 .

It is a cyclic number.

It is not a de Polignac number, because 800519521 - 2¹⁹ = 799995233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (800519527) 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, 1487686 + ... + 1488223.

It is an arithmetic number, because the mean of its divisors is an integer number (200873925).

Almost surely, 2^800519521 is an apocalyptic number.

It is an amenable number.

800519521 is a deficient number, since it is larger than the sum of its proper divisors (2976179).

800519521 is a wasteful number, since it uses less digits than its factorization.

800519521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976178.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 800519521 is about 28293.4536774852. The cubic root of 800519521 is about 928.5186734785.

The spelling of 800519521 in words is "eight hundred million, five hundred nineteen thousand, five hundred twenty-one".