121603609 has 2 divisors, whose sum is σ = 121603610. Its totient is φ = 121603608.

The previous prime is 121603597. The next prime is 121603679. The reversal of 121603609 is 906306121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118374400 + 3229209 = 10880^2 + 1797^2 .

It is a cyclic number.

It is not a de Polignac number, because 121603609 - 2⁵ = 121603577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121603679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60801804 + 60801805.

It is an arithmetic number, because the mean of its divisors is an integer number (60801805).

Almost surely, 2^121603609 is an apocalyptic number.

It is an amenable number.

121603609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121603609 is an equidigital number, since it uses as much as digits as its factorization.

121603609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 121603609 is about 11027.4026406947. The cubic root of 121603609 is about 495.4298330881.

The spelling of 121603609 in words is "one hundred twenty-one million, six hundred three thousand, six hundred nine".