802645521 has 16 divisors (see below), whose sum is σ = 1117140480. Its totient is φ = 512012160.

The previous prime is 802645517. The next prime is 802645549. The reversal of 802645521 is 125546208.

It is not a de Polignac number, because 802645521 - 2² = 802645517 is a prime.

It is a super-2 number, since 2×802645521² = 1288479664762722882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (802645321) 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 15 ways as a sum of consecutive naturals, for example, 40210 + ... + 56763.

It is an arithmetic number, because the mean of its divisors is an integer number (69821280).

Almost surely, 2^802645521 is an apocalyptic number.

It is an amenable number.

802645521 is a deficient number, since it is larger than the sum of its proper divisors (314494959).

802645521 is a wasteful number, since it uses less digits than its factorization.

802645521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97096.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 802645521 is about 28330.9992940595. Note that the first 3 decimals coincide. The cubic root of 802645521 is about 929.3399258838.

The spelling of 802645521 in words is "eight hundred two million, six hundred forty-five thousand, five hundred twenty-one".