121288517 has 4 divisors (see below), whose sum is σ = 138615456. Its totient is φ = 103961580.

The previous prime is 121288511. The next prime is 121288543. The reversal of 121288517 is 715882121.

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 121288517 - 2⁴ = 121288501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121288511) 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, 8663459 + ... + 8663472.

It is an arithmetic number, because the mean of its divisors is an integer number (34653864).

Almost surely, 2^121288517 is an apocalyptic number.

It is an amenable number.

121288517 is a deficient number, since it is larger than the sum of its proper divisors (17326939).

121288517 is an equidigital number, since it uses as much as digits as its factorization.

121288517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17326938.

The product of its digits is 8960, while the sum is 35.

The square root of 121288517 is about 11013.1066007735. The cubic root of 121288517 is about 495.0015535781.

The spelling of 121288517 in words is "one hundred twenty-one million, two hundred eighty-eight thousand, five hundred seventeen".