1680980971 has 8 divisors (see below), whose sum is σ = 1686218688. Its totient is φ = 1675752000.

The previous prime is 1680980963. The next prime is 1680980993. The reversal of 1680980971 is 1790890861.

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 1680980971 - 2³ = 1680980963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680980071) 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, 640041 + ... + 642661.

It is an arithmetic number, because the mean of its divisors is an integer number (210777336).

Almost surely, 2^1680980971 is an apocalyptic number.

1680980971 is a deficient number, since it is larger than the sum of its proper divisors (5237717).

1680980971 is a wasteful number, since it uses less digits than its factorization.

1680980971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 1680980971 is about 40999.7679383677. The cubic root of 1680980971 is about 1189.0157270819.

The spelling of 1680980971 in words is "one billion, six hundred eighty million, nine hundred eighty thousand, nine hundred seventy-one".