652124021 has 2 divisors, whose sum is σ = 652124022. Its totient is φ = 652124020.

The previous prime is 652124009. The next prime is 652124027. The reversal of 652124021 is 120421256.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429069796 + 223054225 = 20714^2 + 14935^2 .

It is a cyclic number.

It is not a de Polignac number, because 652124021 - 2¹⁴ = 652107637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (652124027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326062010 + 326062011.

It is an arithmetic number, because the mean of its divisors is an integer number (326062011).

Almost surely, 2^652124021 is an apocalyptic number.

It is an amenable number.

652124021 is a deficient number, since it is larger than the sum of its proper divisors (1).

652124021 is an equidigital number, since it uses as much as digits as its factorization.

652124021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 652124021 is about 25536.7190727392. The cubic root of 652124021 is about 867.1816230715.

Adding to 652124021 its reverse (120421256), we get a palindrome (772545277).

The spelling of 652124021 in words is "six hundred fifty-two million, one hundred twenty-four thousand, twenty-one".