652944221 has 2 divisors, whose sum is σ = 652944222. Its totient is φ = 652944220.

The previous prime is 652944191. The next prime is 652944233. The reversal of 652944221 is 122449256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630712996 + 22231225 = 25114^2 + 4715^2 .

It is a cyclic number.

It is not a de Polignac number, because 652944221 - 2¹⁰ = 652943197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (652944421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326472110 + 326472111.

It is an arithmetic number, because the mean of its divisors is an integer number (326472111).

Almost surely, 2^652944221 is an apocalyptic number.

It is an amenable number.

652944221 is a deficient number, since it is larger than the sum of its proper divisors (1).

652944221 is an equidigital number, since it uses as much as digits as its factorization.

652944221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 652944221 is about 25552.7732545804. The cubic root of 652944221 is about 867.5450326680.

The spelling of 652944221 in words is "six hundred fifty-two million, nine hundred forty-four thousand, two hundred twenty-one".