861404543 has 4 divisors (see below), whose sum is σ = 876004680. Its totient is φ = 846804408.

The previous prime is 861404519. The next prime is 861404591. The reversal of 861404543 is 345404168.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 861404543 - 2¹⁰ = 861403519 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 (861404503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7299980 + ... + 7300097.

It is an arithmetic number, because the mean of its divisors is an integer number (219001170).

Almost surely, 2^861404543 is an apocalyptic number.

861404543 is a deficient number, since it is larger than the sum of its proper divisors (14600137).

861404543 is a wasteful number, since it uses less digits than its factorization.

861404543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14600136.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 861404543 is about 29349.6940869918. The cubic root of 861404543 is about 951.4859636816.

The spelling of 861404543 in words is "eight hundred sixty-one million, four hundred four thousand, five hundred forty-three".