121443409 has 2 divisors, whose sum is σ = 121443410. Its totient is φ = 121443408.

The previous prime is 121443389. The next prime is 121443431. The reversal of 121443409 is 904344121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90307009 + 31136400 = 9503^2 + 5580^2 .

It is a cyclic number.

It is not a de Polignac number, because 121443409 - 2⁷ = 121443281 is a prime.

It is not a weakly prime, because it can be changed into another prime (121443479) 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, 60721704 + 60721705.

It is an arithmetic number, because the mean of its divisors is an integer number (60721705).

Almost surely, 2^121443409 is an apocalyptic number.

It is an amenable number.

121443409 is a deficient number, since it is larger than the sum of its proper divisors (1).

121443409 is an equidigital number, since it uses as much as digits as its factorization.

121443409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 121443409 is about 11020.1365236552. The cubic root of 121443409 is about 495.2121785344.

The spelling of 121443409 in words is "one hundred twenty-one million, four hundred forty-three thousand, four hundred nine".