620494909 has 2 divisors, whose sum is σ = 620494910. Its totient is φ = 620494908.

The previous prime is 620494891. The next prime is 620494937. The reversal of 620494909 is 909494026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 607376025 + 13118884 = 24645^2 + 3622^2 .

It is a cyclic number.

It is not a de Polignac number, because 620494909 - 2¹³ = 620486717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620494939) 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, 310247454 + 310247455.

It is an arithmetic number, because the mean of its divisors is an integer number (310247455).

Almost surely, 2^620494909 is an apocalyptic number.

It is an amenable number.

620494909 is a deficient number, since it is larger than the sum of its proper divisors (1).

620494909 is an equidigital number, since it uses as much as digits as its factorization.

620494909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 620494909 is about 24909.7352254094. The cubic root of 620494909 is about 852.9287249976.

The spelling of 620494909 in words is "six hundred twenty million, four hundred ninety-four thousand, nine hundred nine".