1681987275 has 60 divisors (see below), whose sum is σ = 3148109272. Its totient is φ = 887708160.

The previous prime is 1681987271. The next prime is 1681987297. The reversal of 1681987275 is 5727891861.

It is not a de Polignac number, because 1681987275 - 2² = 1681987271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681987271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 192144 + ... + 200706.

Almost surely, 2^1681987275 is an apocalyptic number.

1681987275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1681987275 is a deficient number, since it is larger than the sum of its proper divisors (1466121997).

1681987275 is an equidigital number, since it uses as much as digits as its factorization.

1681987275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8682 (or 8668 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 1681987275 is about 41012.0381717368. The cubic root of 1681987275 is about 1189.2529442430.

The spelling of 1681987275 in words is "one billion, six hundred eighty-one million, nine hundred eighty-seven thousand, two hundred seventy-five".