121456409 has 2 divisors, whose sum is σ = 121456410. Its totient is φ = 121456408.

The previous prime is 121456403. The next prime is 121456421. The reversal of 121456409 is 904654121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95160025 + 26296384 = 9755^2 + 5128^2 .

It is a cyclic number.

It is not a de Polignac number, because 121456409 - 2²⁴ = 104679193 is a prime.

It is not a weakly prime, because it can be changed into another prime (121456403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60728204 + 60728205.

It is an arithmetic number, because the mean of its divisors is an integer number (60728205).

Almost surely, 2^121456409 is an apocalyptic number.

It is an amenable number.

121456409 is a deficient number, since it is larger than the sum of its proper divisors (1).

121456409 is an equidigital number, since it uses as much as digits as its factorization.

121456409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 121456409 is about 11020.7263372248. The cubic root of 121456409 is about 495.2298480225.

The spelling of 121456409 in words is "one hundred twenty-one million, four hundred fifty-six thousand, four hundred nine".