620005021 has 2 divisors, whose sum is σ = 620005022. Its totient is φ = 620005020.

The previous prime is 620005013. The next prime is 620005031. The reversal of 620005021 is 120500026.

It is a happy number.

620005021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595896921 + 24108100 = 24411^2 + 4910^2 .

It is a cyclic number.

It is not a de Polignac number, because 620005021 - 2³ = 620005013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 620004986 and 620005004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620005031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310002510 + 310002511.

It is an arithmetic number, because the mean of its divisors is an integer number (310002511).

Almost surely, 2^620005021 is an apocalyptic number.

It is an amenable number.

620005021 is a deficient number, since it is larger than the sum of its proper divisors (1).

620005021 is an equidigital number, since it uses as much as digits as its factorization.

620005021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 620005021 is about 24899.9000198796. The cubic root of 620005021 is about 852.7042001586.

Adding to 620005021 its reverse (120500026), we get a palindrome (740505047).

The spelling of 620005021 in words is "six hundred twenty million, five thousand, twenty-one".