1680871249 has 2 divisors, whose sum is σ = 1680871250. Its totient is φ = 1680871248.

The previous prime is 1680871223. The next prime is 1680871259. The reversal of 1680871249 is 9421780861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1335171600 + 345699649 = 36540^2 + 18593^2 .

It is an emirp because it is prime and its reverse (9421780861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1680871249 - 2¹³ = 1680863057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1680871199 and 1680871208.

It is not a weakly prime, because it can be changed into another prime (1680871259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840435624 + 840435625.

It is an arithmetic number, because the mean of its divisors is an integer number (840435625).

Almost surely, 2^1680871249 is an apocalyptic number.

It is an amenable number.

1680871249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680871249 is an equidigital number, since it uses as much as digits as its factorization.

1680871249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 1680871249 is about 40998.4298357876. The cubic root of 1680871249 is about 1188.9898564693.

The spelling of 1680871249 in words is "one billion, six hundred eighty million, eight hundred seventy-one thousand, two hundred forty-nine".