121515117 has 4 divisors (see below), whose sum is σ = 162020160. Its totient is φ = 81010076.

The previous prime is 121515109. The next prime is 121515137. The reversal of 121515117 is 711515121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121515117 - 2³ = 121515109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121515137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20252517 + ... + 20252522.

It is an arithmetic number, because the mean of its divisors is an integer number (40505040).

Almost surely, 2^121515117 is an apocalyptic number.

It is an amenable number.

121515117 is a deficient number, since it is larger than the sum of its proper divisors (40505043).

121515117 is an equidigital number, since it uses as much as digits as its factorization.

121515117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40505042.

The product of its digits is 350, while the sum is 24.

The square root of 121515117 is about 11023.3895422415. The cubic root of 121515117 is about 495.3096277310.

The spelling of 121515117 in words is "one hundred twenty-one million, five hundred fifteen thousand, one hundred seventeen".