620245321 has 2 divisors, whose sum is σ = 620245322. Its totient is φ = 620245320.

The previous prime is 620245313. The next prime is 620245333. The reversal of 620245321 is 123542026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595604025 + 24641296 = 24405^2 + 4964^2 .

It is a cyclic number.

It is not a de Polignac number, because 620245321 - 2³ = 620245313 is a prime.

It is not a weakly prime, because it can be changed into another prime (620245121) 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, 310122660 + 310122661.

It is an arithmetic number, because the mean of its divisors is an integer number (310122661).

Almost surely, 2^620245321 is an apocalyptic number.

It is an amenable number.

620245321 is a deficient number, since it is larger than the sum of its proper divisors (1).

620245321 is an equidigital number, since it uses as much as digits as its factorization.

620245321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 620245321 is about 24904.7248730035. The cubic root of 620245321 is about 852.8143489187.

Adding to 620245321 its reverse (123542026), we get a palindrome (743787347).

The spelling of 620245321 in words is "six hundred twenty million, two hundred forty-five thousand, three hundred twenty-one".