121518109 has 8 divisors (see below), whose sum is σ = 126344960. Its totient is φ = 116748000.

The previous prime is 121518107. The next prime is 121518119. The reversal of 121518109 is 901815121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121518109 - 2¹ = 121518107 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 (121518107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9792 + ... + 18409.

It is an arithmetic number, because the mean of its divisors is an integer number (15793120).

Almost surely, 2^121518109 is an apocalyptic number.

It is an amenable number.

121518109 is a deficient number, since it is larger than the sum of its proper divisors (4826851).

121518109 is a wasteful number, since it uses less digits than its factorization.

121518109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28371.

The product of its (nonzero) digits is 720, while the sum is 28.

The square root of 121518109 is about 11023.5252528399. The cubic root of 121518109 is about 495.3136929433.

The spelling of 121518109 in words is "one hundred twenty-one million, five hundred eighteen thousand, one hundred nine".