1680239971 has 2 divisors, whose sum is σ = 1680239972. Its totient is φ = 1680239970.

The previous prime is 1680239969. The next prime is 1680240013. The reversal of 1680239971 is 1799320861.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1680239971 - 2¹ = 1680239969 is a prime.

Together with 1680239969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1680239941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840119985 + 840119986.

It is an arithmetic number, because the mean of its divisors is an integer number (840119986).

Almost surely, 2^1680239971 is an apocalyptic number.

1680239971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680239971 is an equidigital number, since it uses as much as digits as its factorization.

1680239971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1680239971 is about 40990.7303057655. The cubic root of 1680239971 is about 1188.8409897981.

The spelling of 1680239971 in words is "one billion, six hundred eighty million, two hundred thirty-nine thousand, nine hundred seventy-one".