1680115289 has 2 divisors, whose sum is σ = 1680115290. Its totient is φ = 1680115288.

The previous prime is 1680115243. The next prime is 1680115291. The reversal of 1680115289 is 9825110861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1639602064 + 40513225 = 40492^2 + 6365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680115289 is a prime.

Together with 1680115291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1680112289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840057644 + 840057645.

It is an arithmetic number, because the mean of its divisors is an integer number (840057645).

Almost surely, 2^1680115289 is an apocalyptic number.

It is an amenable number.

1680115289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680115289 is an equidigital number, since it uses as much as digits as its factorization.

1680115289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 41.

The square root of 1680115289 is about 40989.2094215051. The cubic root of 1680115289 is about 1188.8115831377.

The spelling of 1680115289 in words is "one billion, six hundred eighty million, one hundred fifteen thousand, two hundred eighty-nine".