802055521 has 4 divisors (see below), whose sum is σ = 805856944. Its totient is φ = 798254100.

The previous prime is 802055509. The next prime is 802055533. The reversal of 802055521 is 125550208.

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 an interprime number because it is at equal distance from previous prime (802055509) and next prime (802055533).

It is a cyclic number.

It is not a de Polignac number, because 802055521 - 2¹⁹ = 801531233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 802055521.

It is not an unprimeable number, because it can be changed into a prime (802055561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1900395 + ... + 1900816.

It is an arithmetic number, because the mean of its divisors is an integer number (201464236).

Almost surely, 2^802055521 is an apocalyptic number.

It is an amenable number.

802055521 is a deficient number, since it is larger than the sum of its proper divisors (3801423).

802055521 is a wasteful number, since it uses less digits than its factorization.

802055521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801422.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 802055521 is about 28320.5847573810. The cubic root of 802055521 is about 929.1121603486.

The spelling of 802055521 in words is "eight hundred two million, fifty-five thousand, five hundred twenty-one".