121686709 has 8 divisors (see below), whose sum is σ = 122774400. Its totient is φ = 120604176.

The previous prime is 121686683. The next prime is 121686737. The reversal of 121686709 is 907686121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121686709 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 (121686739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57264 + ... + 59350.

It is an arithmetic number, because the mean of its divisors is an integer number (15346800).

Almost surely, 2^121686709 is an apocalyptic number.

It is an amenable number.

121686709 is a deficient number, since it is larger than the sum of its proper divisors (1087691).

121686709 is a wasteful number, since it uses less digits than its factorization.

121686709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 121686709 is about 11031.1698835618. The cubic root of 121686709 is about 495.5426610019.

The spelling of 121686709 in words is "one hundred twenty-one million, six hundred eighty-six thousand, seven hundred nine".