121660013 has 2 divisors, whose sum is σ = 121660014. Its totient is φ = 121660012.

The previous prime is 121660003. The next prime is 121660039. The reversal of 121660013 is 310066121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93760489 + 27899524 = 9683^2 + 5282^2 .

It is a cyclic number.

It is not a de Polignac number, because 121660013 - 2¹⁴ = 121643629 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121660003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60830006 + 60830007.

It is an arithmetic number, because the mean of its divisors is an integer number (60830007).

Almost surely, 2^121660013 is an apocalyptic number.

It is an amenable number.

121660013 is a deficient number, since it is larger than the sum of its proper divisors (1).

121660013 is an equidigital number, since it uses as much as digits as its factorization.

121660013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 121660013 is about 11029.9597914045. The cubic root of 121660013 is about 495.5064204666.

The spelling of 121660013 in words is "one hundred twenty-one million, six hundred sixty thousand, thirteen".