121513909 has 16 divisors (see below), whose sum is σ = 142067520. Its totient is φ = 102703360.

The previous prime is 121513907. The next prime is 121513919. The reversal of 121513909 is 909315121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121513909 - 2¹ = 121513907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121513901) 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 in 15 ways as a sum of consecutive naturals, for example, 11607 + ... + 19435.

It is an arithmetic number, because the mean of its divisors is an integer number (8879220).

Almost surely, 2^121513909 is an apocalyptic number.

It is an amenable number.

121513909 is a deficient number, since it is larger than the sum of its proper divisors (20553611).

121513909 is a wasteful number, since it uses less digits than its factorization.

121513909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7940.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 121513909 is about 11023.3347495211. The cubic root of 121513909 is about 495.3079864098.

The spelling of 121513909 in words is "one hundred twenty-one million, five hundred thirteen thousand, nine hundred nine".