121323409 has 2 divisors, whose sum is σ = 121323410. Its totient is φ = 121323408.

The previous prime is 121323383. The next prime is 121323473. The reversal of 121323409 is 904323121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106090000 + 15233409 = 10300^2 + 3903^2 .

It is a cyclic number.

It is not a de Polignac number, because 121323409 - 2²¹ = 119226257 is a prime.

It is not a weakly prime, because it can be changed into another prime (121323479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60661704 + 60661705.

It is an arithmetic number, because the mean of its divisors is an integer number (60661705).

Almost surely, 2^121323409 is an apocalyptic number.

It is an amenable number.

121323409 is a deficient number, since it is larger than the sum of its proper divisors (1).

121323409 is an equidigital number, since it uses as much as digits as its factorization.

121323409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 121323409 is about 11014.6905993768. The cubic root of 121323409 is about 495.0490159944.

The spelling of 121323409 in words is "one hundred twenty-one million, three hundred twenty-three thousand, four hundred nine".