652457021 has 2 divisors, whose sum is σ = 652457022. Its totient is φ = 652457020.

The previous prime is 652456967. The next prime is 652457023. The reversal of 652457021 is 120754256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 589809796 + 62647225 = 24286^2 + 7915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-652457021 is a prime.

Together with 652457023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (652457023) 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, 326228510 + 326228511.

It is an arithmetic number, because the mean of its divisors is an integer number (326228511).

Almost surely, 2^652457021 is an apocalyptic number.

It is an amenable number.

652457021 is a deficient number, since it is larger than the sum of its proper divisors (1).

652457021 is an equidigital number, since it uses as much as digits as its factorization.

652457021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 652457021 is about 25543.2382637754. The cubic root of 652457021 is about 867.3292035585.

The spelling of 652457021 in words is "six hundred fifty-two million, four hundred fifty-seven thousand, twenty-one".