861382543 has 6 divisors (see below), whose sum is σ = 984525944. Its totient is φ = 738261336.

The previous prime is 861382513. The next prime is 861382567. The reversal of 861382543 is 345283168.

It is not a de Polignac number, because 861382543 - 2²¹ = 859285391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861382496 and 861382505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861382513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72105 + ... + 83197.

Almost surely, 2^861382543 is an apocalyptic number.

861382543 is a deficient number, since it is larger than the sum of its proper divisors (123143401).

861382543 is an frugal number, since it uses more digits than its factorization.

861382543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22193 (or 11100 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 861382543 is about 29349.3192936395. The cubic root of 861382543 is about 951.4778633956.

The spelling of 861382543 in words is "eight hundred sixty-one million, three hundred eighty-two thousand, five hundred forty-three".