1680032281 has 4 divisors (see below), whose sum is σ = 1680286464. Its totient is φ = 1679778100.

The previous prime is 1680032267. The next prime is 1680032311. The reversal of 1680032281 is 1822300861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1822300861 = 787 ⋅2315503.

It is a cyclic number.

It is not a de Polignac number, because 1680032281 - 2¹⁹ = 1679507993 is a prime.

It is a super-3 number, since 3×1680032281³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680032201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116905 + ... + 130486.

It is an arithmetic number, because the mean of its divisors is an integer number (420071616).

Almost surely, 2^1680032281 is an apocalyptic number.

It is an amenable number.

1680032281 is a deficient number, since it is larger than the sum of its proper divisors (254183).

1680032281 is an equidigital number, since it uses as much as digits as its factorization.

1680032281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254182.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1680032281 is about 40988.1968498250. The cubic root of 1680032281 is about 1188.7920046207.

The spelling of 1680032281 in words is "one billion, six hundred eighty million, thirty-two thousand, two hundred eighty-one".