1680871477 has 2 divisors, whose sum is σ = 1680871478. Its totient is φ = 1680871476.

The previous prime is 1680871471. The next prime is 1680871513. The reversal of 1680871477 is 7741780861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 867538116 + 813333361 = 29454^2 + 28519^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680871477 - 2¹⁹ = 1680347189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1680871477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680871471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840435738 + 840435739.

It is an arithmetic number, because the mean of its divisors is an integer number (840435739).

Almost surely, 2^1680871477 is an apocalyptic number.

It is an amenable number.

1680871477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680871477 is an equidigital number, since it uses as much as digits as its factorization.

1680871477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 526848, while the sum is 49.

The square root of 1680871477 is about 40998.4326163818. The cubic root of 1680871477 is about 1188.9899102291.

The spelling of 1680871477 in words is "one billion, six hundred eighty million, eight hundred seventy-one thousand, four hundred seventy-seven".