652021 has 4 divisors (see below), whose sum is σ = 656332. Its totient is φ = 647712.

The previous prime is 652019. The next prime is 652033. The reversal of 652021 is 120256.

It is a happy number.

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 72900 + 579121 = 270^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 652021 - 2¹ = 652019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651986 and 652004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (652081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920 + ... + 2233.

It is an arithmetic number, because the mean of its divisors is an integer number (164083).

2⁶⁵²⁰²¹ is an apocalyptic number.

It is an amenable number.

652021 is a deficient number, since it is larger than the sum of its proper divisors (4311).

652021 is a wasteful number, since it uses less digits than its factorization.

652021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 652021 is about 807.4781730796. The cubic root of 652021 is about 86.7135955571.

Adding to 652021 its reverse (120256), we get a palindrome (772277).

The spelling of 652021 in words is "six hundred fifty-two thousand, twenty-one".