121605065 has 4 divisors (see below), whose sum is σ = 145926084. Its totient is φ = 97284048.

The previous prime is 121605059. The next prime is 121605089. The reversal of 121605065 is 560506121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 83028544 + 38576521 = 9112^2 + 6211^2 .

It is a cyclic number.

It is not a de Polignac number, because 121605065 - 2⁴ = 121605049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 12160502 + ... + 12160511.

It is an arithmetic number, because the mean of its divisors is an integer number (36481521).

Almost surely, 2^121605065 is an apocalyptic number.

It is an amenable number.

121605065 is a deficient number, since it is larger than the sum of its proper divisors (24321019).

121605065 is an equidigital number, since it uses as much as digits as its factorization.

121605065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24321018.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 121605065 is about 11027.4686578562. The cubic root of 121605065 is about 495.4318103949.

The spelling of 121605065 in words is "one hundred twenty-one million, six hundred five thousand, sixty-five".