620813 has 2 divisors, whose sum is σ = 620814. Its totient is φ = 620812.

The previous prime is 620777. The next prime is 620821. The reversal of 620813 is 318026.

620813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619369 + 1444 = 787^2 + 38^2 .

It is a cyclic number.

It is not a de Polignac number, because 620813 - 2¹² = 616717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310406 + 310407.

It is an arithmetic number, because the mean of its divisors is an integer number (310407).

2⁶²⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

620813 is a deficient number, since it is larger than the sum of its proper divisors (1).

620813 is an equidigital number, since it uses as much as digits as its factorization.

620813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 620813 is about 787.9168737881. The cubic root of 620813 is about 85.3074448784.

Adding to 620813 its reverse (318026), we get a palindrome (938839).

The spelling of 620813 in words is "six hundred twenty thousand, eight hundred thirteen".