1680000891 has 8 divisors (see below), whose sum is σ = 2337392640. Its totient is φ = 1071304872.

The previous prime is 1680000863. The next prime is 1680000941. The reversal of 1680000891 is 1980000861.

1680000891 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1680000891 - 2⁵ = 1680000859 is a prime.

1680000891 is a strobogrammatic number because it is the same when read upside-down.

It is not an unprimeable number, because it can be changed into a prime (1680000851) 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, 12173851 + ... + 12173988.

It is an arithmetic number, because the mean of its divisors is an integer number (292174080).

Almost surely, 2^1680000891 is an apocalyptic number.

1680000891 is a deficient number, since it is larger than the sum of its proper divisors (657391749).

1680000891 is a wasteful number, since it uses less digits than its factorization.

1680000891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24347865.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1680000891 is about 40987.8139329240. The cubic root of 1680000891 is about 1188.7846007127.

The spelling of 1680000891 in words is "one billion, six hundred eighty million, eight hundred ninety-one", and thus it is an aban number.