620279813 has 2 divisors, whose sum is σ = 620279814. Its totient is φ = 620279812.

The previous prime is 620279791. The next prime is 620279827. The reversal of 620279813 is 318972026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582112129 + 38167684 = 24127^2 + 6178^2 .

It is a cyclic number.

It is not a de Polignac number, because 620279813 - 2¹² = 620275717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620279873) 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, 310139906 + 310139907.

It is an arithmetic number, because the mean of its divisors is an integer number (310139907).

Almost surely, 2^620279813 is an apocalyptic number.

It is an amenable number.

620279813 is a deficient number, since it is larger than the sum of its proper divisors (1).

620279813 is an equidigital number, since it uses as much as digits as its factorization.

620279813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 620279813 is about 24905.4173424177. The cubic root of 620279813 is about 852.8301570332.

The spelling of 620279813 in words is "six hundred twenty million, two hundred seventy-nine thousand, eight hundred thirteen".