652721121 has 12 divisors (see below), whose sum is σ = 1015344148. Its totient is φ = 401674464.

The previous prime is 652721099. The next prime is 652721143. The reversal of 652721121 is 121127256.

652721121 is a `hidden beast` number, since 652 + 7 + 2 + 1 + 1 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (652721099) and next prime (652721143).

It can be written as a sum of positive squares in 2 ways, for example, as 261274896 + 391446225 = 16164^2 + 19785^2 .

It is not a de Polignac number, because 652721121 - 2⁹ = 652720609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (652721191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2789290 + ... + 2789523.

Almost surely, 2^652721121 is an apocalyptic number.

It is an amenable number.

652721121 is a deficient number, since it is larger than the sum of its proper divisors (362623027).

652721121 is a wasteful number, since it uses less digits than its factorization.

652721121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5578832 (or 5578829 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 652721121 is about 25548.4074063336. The cubic root of 652721121 is about 867.4462129225.

Adding to 652721121 its reverse (121127256), we get a palindrome (773848377).

The spelling of 652721121 in words is "six hundred fifty-two million, seven hundred twenty-one thousand, one hundred twenty-one".