121660153 has 4 divisors (see below), whose sum is σ = 121683060. Its totient is φ = 121637248.

The previous prime is 121660129. The next prime is 121660163. The reversal of 121660153 is 351066121.

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 58171129 + 63489024 = 7627^2 + 7968^2 .

It is a cyclic number.

It is not a de Polignac number, because 121660153 - 2¹⁷ = 121529081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121660163) 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 in 3 ways as a sum of consecutive naturals, for example, 1101 + ... + 15637.

It is an arithmetic number, because the mean of its divisors is an integer number (30420765).

Almost surely, 2^121660153 is an apocalyptic number.

It is an amenable number.

121660153 is a deficient number, since it is larger than the sum of its proper divisors (22907).

121660153 is an equidigital number, since it uses as much as digits as its factorization.

121660153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22906.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 121660153 is about 11029.9661377540. The cubic root of 121660153 is about 495.5066105342.

The spelling of 121660153 in words is "one hundred twenty-one million, six hundred sixty thousand, one hundred fifty-three".