5621521 has 8 divisors (see below), whose sum is σ = 5820840. Its totient is φ = 5424768.

The previous prime is 5621513. The next prime is 5621597. The reversal of 5621521 is 1251265.

It can be written as a sum of positive squares in 4 ways, for example, as 608400 + 5013121 = 780^2 + 2239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5621521 - 2³ = 5621513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5621492 and 5621501.

It is not an unprimeable number, because it can be changed into a prime (5621221) 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 7 ways as a sum of consecutive naturals, for example, 4515 + ... + 5623.

It is an arithmetic number, because the mean of its divisors is an integer number (727605).

Almost surely, 2^5621521 is an apocalyptic number.

It is an amenable number.

5621521 is a deficient number, since it is larger than the sum of its proper divisors (199319).

5621521 is a wasteful number, since it uses less digits than its factorization.

5621521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283.

The product of its digits is 600, while the sum is 22.

The square root of 5621521 is about 2370.9746940868. The cubic root of 5621521 is about 177.8079926798.

Adding to 5621521 its reverse (1251265), we get a palindrome (6872786).

The spelling of 5621521 in words is "five million, six hundred twenty-one thousand, five hundred twenty-one".