620509013 has 2 divisors, whose sum is σ = 620509014. Its totient is φ = 620509012.

The previous prime is 620509003. The next prime is 620509039. The reversal of 620509013 is 310905026.

It is an a-pointer prime, because the next prime (620509039) can be obtained adding 620509013 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492751204 + 127757809 = 22198^2 + 11303^2 .

It is a cyclic number.

It is not a de Polignac number, because 620509013 - 2⁴ = 620508997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620509003) 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, 310254506 + 310254507.

It is an arithmetic number, because the mean of its divisors is an integer number (310254507).

Almost surely, 2^620509013 is an apocalyptic number.

It is an amenable number.

620509013 is a deficient number, since it is larger than the sum of its proper divisors (1).

620509013 is an equidigital number, since it uses as much as digits as its factorization.

620509013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 620509013 is about 24910.0183259668. The cubic root of 620509013 is about 852.9351873743.

The spelling of 620509013 in words is "six hundred twenty million, five hundred nine thousand, thirteen".