121660541 has 2 divisors, whose sum is σ = 121660542. Its totient is φ = 121660540.

The previous prime is 121660531. The next prime is 121660573. The reversal of 121660541 is 145066121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113337316 + 8323225 = 10646^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 121660541 - 2¹⁴ = 121644157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121660541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121660531) 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, 60830270 + 60830271.

It is an arithmetic number, because the mean of its divisors is an integer number (60830271).

Almost surely, 2^121660541 is an apocalyptic number.

It is an amenable number.

121660541 is a deficient number, since it is larger than the sum of its proper divisors (1).

121660541 is an equidigital number, since it uses as much as digits as its factorization.

121660541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 121660541 is about 11029.9837261893. The cubic root of 121660541 is about 495.5071372922.

The spelling of 121660541 in words is "one hundred twenty-one million, six hundred sixty thousand, five hundred forty-one".