121505441 has 2 divisors, whose sum is σ = 121505442. Its totient is φ = 121505440.

The previous prime is 121505431. The next prime is 121505453. The reversal of 121505441 is 144505121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118897216 + 2608225 = 10904^2 + 1615^2 .

It is an emirp because it is prime and its reverse (144505121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121505441 - 2¹⁰ = 121504417 is a prime.

It is not a weakly prime, because it can be changed into another prime (121505411) 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, 60752720 + 60752721.

It is an arithmetic number, because the mean of its divisors is an integer number (60752721).

Almost surely, 2^121505441 is an apocalyptic number.

It is an amenable number.

121505441 is a deficient number, since it is larger than the sum of its proper divisors (1).

121505441 is an equidigital number, since it uses as much as digits as its factorization.

121505441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 121505441 is about 11022.9506485333. The cubic root of 121505441 is about 495.2964805515.

The spelling of 121505441 in words is "one hundred twenty-one million, five hundred five thousand, four hundred forty-one".