121442309 has 2 divisors, whose sum is σ = 121442310. Its totient is φ = 121442308.

The previous prime is 121442303. The next prime is 121442317. The reversal of 121442309 is 903244121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103591684 + 17850625 = 10178^2 + 4225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121442309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121442303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60721154 + 60721155.

It is an arithmetic number, because the mean of its divisors is an integer number (60721155).

Almost surely, 2^121442309 is an apocalyptic number.

It is an amenable number.

121442309 is a deficient number, since it is larger than the sum of its proper divisors (1).

121442309 is an equidigital number, since it uses as much as digits as its factorization.

121442309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 121442309 is about 11020.0866149046. The cubic root of 121442309 is about 495.2106833660.

The spelling of 121442309 in words is "one hundred twenty-one million, four hundred forty-two thousand, three hundred nine".