620406613 has 2 divisors, whose sum is σ = 620406614. Its totient is φ = 620406612.

The previous prime is 620406607. The next prime is 620406637. The reversal of 620406613 is 316604026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 603291844 + 17114769 = 24562^2 + 4137^2 .

It is a cyclic number.

It is not a de Polignac number, because 620406613 - 2⁵ = 620406581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620406643) 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, 310203306 + 310203307.

It is an arithmetic number, because the mean of its divisors is an integer number (310203307).

Almost surely, 2^620406613 is an apocalyptic number.

It is an amenable number.

620406613 is a deficient number, since it is larger than the sum of its proper divisors (1).

620406613 is an equidigital number, since it uses as much as digits as its factorization.

620406613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 620406613 is about 24907.9628432355. The cubic root of 620406613 is about 852.8882660209. Note that the first 3 decimals are identical.

The spelling of 620406613 in words is "six hundred twenty million, four hundred six thousand, six hundred thirteen".