121680785 has 8 divisors (see below), whose sum is σ = 146160936. Its totient is φ = 97248640.

The previous prime is 121680751. The next prime is 121680817. The reversal of 121680785 is 587086121.

It can be written as a sum of positive squares in 4 ways, for example, as 8620096 + 113060689 = 2936^2 + 10633^2 .

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

It is not a de Polignac number, because 121680785 - 2¹² = 121676689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6164 + ... + 16773.

It is an arithmetic number, because the mean of its divisors is an integer number (18270117).

Almost surely, 2^121680785 is an apocalyptic number.

It is an amenable number.

121680785 is a deficient number, since it is larger than the sum of its proper divisors (24480151).

121680785 is a wasteful number, since it uses less digits than its factorization.

121680785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24003.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 121680785 is about 11030.9013684286. The cubic root of 121680785 is about 495.5346194708.

The spelling of 121680785 in words is "one hundred twenty-one million, six hundred eighty thousand, seven hundred eighty-five".