652921 has 2 divisors, whose sum is σ = 652922. Its totient is φ = 652920.

The previous prime is 652913. The next prime is 652931. The reversal of 652921 is 129256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 44521 = 780^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 652921 - 2³ = 652913 is a prime.

It is a d-powerful number, because it can be written as 6 + 5⁸ + 9² + 2⁶ + 2¹⁸ + 1 .

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (652931) 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 as a sum of consecutive naturals, namely, 326460 + 326461.

It is an arithmetic number, because the mean of its divisors is an integer number (326461).

2⁶⁵²⁹²¹ is an apocalyptic number.

It is an amenable number.

652921 is a deficient number, since it is larger than the sum of its proper divisors (1).

652921 is an equidigital number, since it uses as much as digits as its factorization.

652921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 652921 is about 808.0352715074. The cubic root of 652921 is about 86.7534748225.

The spelling of 652921 in words is "six hundred fifty-two thousand, nine hundred twenty-one".