1680432871 has 4 divisors (see below), whose sum is σ = 1809696952. Its totient is φ = 1551168792.

The previous prime is 1680432863. The next prime is 1680432889. The reversal of 1680432871 is 1782340861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1782340861 = 7 ⋅254620123.

It is a cyclic number.

It is not a de Polignac number, because 1680432871 - 2³ = 1680432863 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 (1680432851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64632021 + ... + 64632046.

It is an arithmetic number, because the mean of its divisors is an integer number (452424238).

Almost surely, 2^1680432871 is an apocalyptic number.

1680432871 is a deficient number, since it is larger than the sum of its proper divisors (129264081).

1680432871 is a wasteful number, since it uses less digits than its factorization.

1680432871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129264080.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1680432871 is about 40993.0832092440. The cubic root of 1680432871 is about 1188.8864830323.

The spelling of 1680432871 in words is "one billion, six hundred eighty million, four hundred thirty-two thousand, eight hundred seventy-one".