121346509 has 2 divisors, whose sum is σ = 121346510. Its totient is φ = 121346508.

The previous prime is 121346501. The next prime is 121346531. The reversal of 121346509 is 905643121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70509609 + 50836900 = 8397^2 + 7130^2 .

It is an emirp because it is prime and its reverse (905643121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121346509 - 2³ = 121346501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121346501) 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, 60673254 + 60673255.

It is an arithmetic number, because the mean of its divisors is an integer number (60673255).

Almost surely, 2^121346509 is an apocalyptic number.

It is an amenable number.

121346509 is a deficient number, since it is larger than the sum of its proper divisors (1).

121346509 is an equidigital number, since it uses as much as digits as its factorization.

121346509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 121346509 is about 11015.7391490540. The cubic root of 121346509 is about 495.0804331426.

The spelling of 121346509 in words is "one hundred twenty-one million, three hundred forty-six thousand, five hundred nine".