1680112789 has 4 divisors (see below), whose sum is σ = 1692376524. Its totient is φ = 1667849056.

The previous prime is 1680112787. The next prime is 1680112793. The reversal of 1680112789 is 9872110861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9872110861 = 23509 ⋅419929.

It can be written as a sum of positive squares in 2 ways, for example, as 751691889 + 928420900 = 27417^2 + 30470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680112789 - 2¹ = 1680112787 is a prime.

It is a super-2 number, since 2×1680112789² = 5645557967522717042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680112781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6131662 + ... + 6131935.

It is an arithmetic number, because the mean of its divisors is an integer number (423094131).

Almost surely, 2^1680112789 is an apocalyptic number.

It is an amenable number.

1680112789 is a deficient number, since it is larger than the sum of its proper divisors (12263735).

1680112789 is a wasteful number, since it uses less digits than its factorization.

1680112789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12263734.

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 1680112789 is about 40989.1789256628. The cubic root of 1680112789 is about 1188.8109934896.

The spelling of 1680112789 in words is "one billion, six hundred eighty million, one hundred twelve thousand, seven hundred eighty-nine".