120605609 has 2 divisors, whose sum is σ = 120605610. Its totient is φ = 120605608.

The previous prime is 120605501. The next prime is 120605651. The reversal of 120605609 is 906506021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115498009 + 5107600 = 10747^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 120605609 - 2¹² = 120601513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (120605689) 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, 60302804 + 60302805.

It is an arithmetic number, because the mean of its divisors is an integer number (60302805).

Almost surely, 2^120605609 is an apocalyptic number.

It is an amenable number.

120605609 is a deficient number, since it is larger than the sum of its proper divisors (1).

120605609 is an equidigital number, since it uses as much as digits as its factorization.

120605609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 120605609 is about 10982.0585046702. The cubic root of 120605609 is about 494.0707785947.

The spelling of 120605609 in words is "one hundred twenty million, six hundred five thousand, six hundred nine".