121441409 has 2 divisors, whose sum is σ = 121441410. Its totient is φ = 121441408.

The previous prime is 121441399. The next prime is 121441433. The reversal of 121441409 is 904144121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78499600 + 42941809 = 8860^2 + 6553^2 .

It is an emirp because it is prime and its reverse (904144121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121441409 - 2⁴ = 121441393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121441459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60720704 + 60720705.

It is an arithmetic number, because the mean of its divisors is an integer number (60720705).

Almost surely, 2^121441409 is an apocalyptic number.

It is an amenable number.

121441409 is a deficient number, since it is larger than the sum of its proper divisors (1).

121441409 is an equidigital number, since it uses as much as digits as its factorization.

121441409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 121441409 is about 11020.0457803042. The cubic root of 121441409 is about 495.2094600397.

The spelling of 121441409 in words is "one hundred twenty-one million, four hundred forty-one thousand, four hundred nine".