802136521 has 4 divisors (see below), whose sum is σ = 809633232. Its totient is φ = 794639812.

The previous prime is 802136497. The next prime is 802136557. The reversal of 802136521 is 125631208.

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 802136521 - 2¹³ = 802128329 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 802136521.

It is not an unprimeable number, because it can be changed into a prime (802136561) 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, 3748195 + ... + 3748408.

It is an arithmetic number, because the mean of its divisors is an integer number (202408308).

Almost surely, 2^802136521 is an apocalyptic number.

It is an amenable number.

802136521 is a deficient number, since it is larger than the sum of its proper divisors (7496711).

802136521 is a wasteful number, since it uses less digits than its factorization.

802136521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7496710.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 802136521 is about 28322.0147764950. The cubic root of 802136521 is about 929.1434364676.

Adding to 802136521 its reverse (125631208), we get a palindrome (927767729).

The spelling of 802136521 in words is "eight hundred two million, one hundred thirty-six thousand, five hundred twenty-one".