8620521 has 36 divisors (see below), whose sum is σ = 14519952. Its totient is φ = 4533984.

The previous prime is 8620499. The next prime is 8620529. The reversal of 8620521 is 1250268.

It is not a de Polignac number, because 8620521 - 2⁷ = 8620393 is a prime.

It is a super-2 number, since 2×8620521² = 148626764622882, which contains 22 as substring.

8620521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8620491 and 8620500.

It is not an unprimeable number, because it can be changed into a prime (8620529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 24670 + ... + 25016.

It is an arithmetic number, because the mean of its divisors is an integer number (403332).

Almost surely, 2^8620521 is an apocalyptic number.

It is an amenable number.

8620521 is a deficient number, since it is larger than the sum of its proper divisors (5899431).

8620521 is a wasteful number, since it uses less digits than its factorization.

8620521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 8620521 is about 2936.0723764921. The cubic root of 8620521 is about 205.0427909880.

Adding to 8620521 its reverse (1250268), we get a palindrome (9870789).

The spelling of 8620521 in words is "eight million, six hundred twenty thousand, five hundred twenty-one".