1680088909 has 2 divisors, whose sum is σ = 1680088910. Its totient is φ = 1680088908.

The previous prime is 1680088853. The next prime is 1680088961. The reversal of 1680088909 is 9098800861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1104232900 + 575856009 = 33230^2 + 23997^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680088909 - 2¹⁵ = 1680056141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680088309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840044454 + 840044455.

It is an arithmetic number, because the mean of its divisors is an integer number (840044455).

Almost surely, 2^1680088909 is an apocalyptic number.

It is an amenable number.

1680088909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680088909 is an equidigital number, since it uses as much as digits as its factorization.

1680088909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 49.

The square root of 1680088909 is about 40988.8876282341. The cubic root of 1680088909 is about 1188.8053611413.

The spelling of 1680088909 in words is "one billion, six hundred eighty million, eighty-eight thousand, nine hundred nine".