4640521 has 4 divisors (see below), whose sum is σ = 4728132. Its totient is φ = 4552912.

The previous prime is 4640501. The next prime is 4640543. The reversal of 4640521 is 1250464.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 3200521 = 1200^2 + 1789^2 .

It is not a de Polignac number, because 4640521 - 2⁷ = 4640393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4640492 and 4640501.

It is not an unprimeable number, because it can be changed into a prime (4640501) 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 3 ways as a sum of consecutive naturals, for example, 43726 + ... + 43831.

It is an arithmetic number, because the mean of its divisors is an integer number (1182033).

Almost surely, 2^4640521 is an apocalyptic number.

It is an amenable number.

4640521 is a deficient number, since it is larger than the sum of its proper divisors (87611).

4640521 is an equidigital number, since it uses as much as digits as its factorization.

4640521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87610.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 4640521 is about 2154.1868535482. The cubic root of 4640521 is about 166.7972607555.

Adding to 4640521 its reverse (1250464), we get a palindrome (5890985).

The spelling of 4640521 in words is "four million, six hundred forty thousand, five hundred twenty-one".