121118517 has 16 divisors (see below), whose sum is σ = 193238080. Its totient is φ = 74534256.

The previous prime is 121118509. The next prime is 121118531. The reversal of 121118517 is 715811121.

It is not a de Polignac number, because 121118517 - 2³ = 121118509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121118507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172183 + ... + 172884.

It is an arithmetic number, because the mean of its divisors is an integer number (12077380).

Almost surely, 2^121118517 is an apocalyptic number.

It is an amenable number.

121118517 is a deficient number, since it is larger than the sum of its proper divisors (72119563).

121118517 is a wasteful number, since it uses less digits than its factorization.

121118517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345089 (or 345083 counting only the distinct ones).

The product of its digits is 560, while the sum is 27.

The square root of 121118517 is about 11005.3858178621. The cubic root of 121118517 is about 494.7701779780.

Adding to 121118517 its reverse (715811121), we get a palindrome (836929638).

The spelling of 121118517 in words is "one hundred twenty-one million, one hundred eighteen thousand, five hundred seventeen".