121517717 has 16 divisors (see below), whose sum is σ = 135136512. Its totient is φ = 108683520.

The previous prime is 121517689. The next prime is 121517719. The reversal of 121517717 is 717715121.

It is a cyclic number.

It is not a de Polignac number, because 121517717 - 2¹² = 121513621 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 (121517719) 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, 64367 + ... + 66227.

It is an arithmetic number, because the mean of its divisors is an integer number (8446032).

Almost surely, 2^121517717 is an apocalyptic number.

121517717 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121517717 is a deficient number, since it is larger than the sum of its proper divisors (13618795).

121517717 is a wasteful number, since it uses less digits than its factorization.

121517717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068.

The product of its digits is 3430, while the sum is 32.

The square root of 121517717 is about 11023.5074726695. The cubic root of 121517717 is about 495.3131603391.

The spelling of 121517717 in words is "one hundred twenty-one million, five hundred seventeen thousand, seven hundred seventeen".