121449409 has 2 divisors, whose sum is σ = 121449410. Its totient is φ = 121449408.

The previous prime is 121449403. The next prime is 121449431. The reversal of 121449409 is 904944121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81721600 + 39727809 = 9040^2 + 6303^2 .

It is an emirp because it is prime and its reverse (904944121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121449409 - 2³ = 121449401 is a prime.

It is not a weakly prime, because it can be changed into another prime (121449401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60724704 + 60724705.

It is an arithmetic number, because the mean of its divisors is an integer number (60724705).

Almost surely, 2^121449409 is an apocalyptic number.

It is an amenable number.

121449409 is a deficient number, since it is larger than the sum of its proper divisors (1).

121449409 is an equidigital number, since it uses as much as digits as its factorization.

121449409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 121449409 is about 11020.4087492252. The cubic root of 121449409 is about 495.2203338394.

The spelling of 121449409 in words is "one hundred twenty-one million, four hundred forty-nine thousand, four hundred nine".