620710609 has 2 divisors, whose sum is σ = 620710610. Its totient is φ = 620710608.

The previous prime is 620710567. The next prime is 620710667. The reversal of 620710609 is 906017026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620259025 + 451584 = 24905^2 + 672^2 .

It is a cyclic number.

It is not a de Polignac number, because 620710609 - 2⁷ = 620710481 is a prime.

It is not a weakly prime, because it can be changed into another prime (620710669) 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, 310355304 + 310355305.

It is an arithmetic number, because the mean of its divisors is an integer number (310355305).

Almost surely, 2^620710609 is an apocalyptic number.

It is an amenable number.

620710609 is a deficient number, since it is larger than the sum of its proper divisors (1).

620710609 is an equidigital number, since it uses as much as digits as its factorization.

620710609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 620710609 is about 24914.0644817340. The cubic root of 620710609 is about 853.0275468730.

The spelling of 620710609 in words is "six hundred twenty million, seven hundred ten thousand, six hundred nine".