1687343543 has 4 divisors (see below), whose sum is σ = 1687666680. Its totient is φ = 1687020408.

The previous prime is 1687343519. The next prime is 1687343573. The reversal of 1687343543 is 3453437861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3453437861 = 113 ⋅30561397.

It is a cyclic number.

It is not a de Polignac number, because 1687343543 - 2¹⁶ = 1687278007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1687343494 and 1687343503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687343513) 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, 153605 + ... + 164222.

It is an arithmetic number, because the mean of its divisors is an integer number (421916670).

Almost surely, 2^1687343543 is an apocalyptic number.

1687343543 is a deficient number, since it is larger than the sum of its proper divisors (323137).

1687343543 is an equidigital number, since it uses as much as digits as its factorization.

1687343543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323136.

The product of its digits is 725760, while the sum is 44.

The square root of 1687343543 is about 41077.2874347857. The cubic root of 1687343543 is about 1190.5139937639.

The spelling of 1687343543 in words is "one billion, six hundred eighty-seven million, three hundred forty-three thousand, five hundred forty-three".