1686000121 has 8 divisors (see below), whose sum is σ = 1854324864. Its totient is φ = 1523194320.

The previous prime is 1686000097. The next prime is 1686000137. The reversal of 1686000121 is 1210006861.

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

It is a cyclic number.

It is not a de Polignac number, because 1686000121 - 2²⁵ = 1652445689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1686000191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1379095 + ... + 1380316.

It is an arithmetic number, because the mean of its divisors is an integer number (231790608).

Almost surely, 2^1686000121 is an apocalyptic number.

It is an amenable number.

1686000121 is a deficient number, since it is larger than the sum of its proper divisors (168324743).

1686000121 is a wasteful number, since it uses less digits than its factorization.

1686000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2759471.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1686000121 is about 41060.9318087157. The cubic root of 1686000121 is about 1190.1979570875.

Adding to 1686000121 its reverse (1210006861), we get a palindrome (2896006982).

The spelling of 1686000121 in words is "one billion, six hundred eighty-six million, one hundred twenty-one", and thus it is an aban number.