1680047309 has 2 divisors, whose sum is σ = 1680047310. Its totient is φ = 1680047308.

The previous prime is 1680047297. The next prime is 1680047363. The reversal of 1680047309 is 9037400861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1584438025 + 95609284 = 39805^2 + 9778^2 .

It is an emirp because it is prime and its reverse (9037400861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680047309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680047009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840023654 + 840023655.

It is an arithmetic number, because the mean of its divisors is an integer number (840023655).

Almost surely, 2^1680047309 is an apocalyptic number.

It is an amenable number.

1680047309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680047309 is an equidigital number, since it uses as much as digits as its factorization.

1680047309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1680047309 is about 40988.3801704825. The cubic root of 1680047309 is about 1188.7955492179.

The spelling of 1680047309 in words is "one billion, six hundred eighty million, forty-seven thousand, three hundred nine".