652821921 has 12 divisors (see below), whose sum is σ = 947853348. Its totient is φ = 432958464.

The previous prime is 652821919. The next prime is 652821943. The reversal of 652821921 is 129128256.

It can be written as a sum of positive squares in 2 ways, for example, as 479610000 + 173211921 = 21900^2 + 13161^2 .

It is not a de Polignac number, because 652821921 - 2¹ = 652821919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (652821971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186180 + ... + 189653.

It is an arithmetic number, because the mean of its divisors is an integer number (78987779).

Almost surely, 2^652821921 is an apocalyptic number.

It is an amenable number.

652821921 is a deficient number, since it is larger than the sum of its proper divisors (295031427).

652821921 is a wasteful number, since it uses less digits than its factorization.

652821921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376032 (or 376029 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 652821921 is about 25550.3800558818. The cubic root of 652821921 is about 867.4908639865.

The spelling of 652821921 in words is "six hundred fifty-two million, eight hundred twenty-one thousand, nine hundred twenty-one".