121111409 has 2 divisors, whose sum is σ = 121111410. Its totient is φ = 121111408.

The previous prime is 121111379. The next prime is 121111421. The reversal of 121111409 is 904111121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109139809 + 11971600 = 10447^2 + 3460^2 .

It is an emirp because it is prime and its reverse (904111121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121111409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121111429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555704 + 60555705.

It is an arithmetic number, because the mean of its divisors is an integer number (60555705).

Almost surely, 2^121111409 is an apocalyptic number.

It is an amenable number.

121111409 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111409 is an equidigital number, since it uses as much as digits as its factorization.

121111409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 121111409 is about 11005.0628803292. The cubic root of 121111409 is about 494.7604990417.

The spelling of 121111409 in words is "one hundred twenty-one million, one hundred eleven thousand, four hundred nine".