802871521 has 4 divisors (see below), whose sum is σ = 809193472. Its totient is φ = 796549572.

The previous prime is 802871513. The next prime is 802871567. The reversal of 802871521 is 125178208.

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 802871521 - 2³ = 802871513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (802871021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3160785 + ... + 3161038.

It is an arithmetic number, because the mean of its divisors is an integer number (202298368).

Almost surely, 2^802871521 is an apocalyptic number.

It is an amenable number.

802871521 is a deficient number, since it is larger than the sum of its proper divisors (6321951).

802871521 is a wasteful number, since it uses less digits than its factorization.

802871521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6321950.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 802871521 is about 28334.9875771986. The cubic root of 802871521 is about 929.4271420990.

The spelling of 802871521 in words is "eight hundred two million, eight hundred seventy-one thousand, five hundred twenty-one".