443940631861 has 4 divisors (see below), whose sum is σ = 452316870252. Its totient is φ = 435564393472.

The previous prime is 443940631859. The next prime is 443940631877. The reversal of 443940631861 is 168136049344.

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

It can be written as a sum of positive squares in 2 ways, for example, as 284355562500 + 159585069361 = 533250^2 + 399481^2 .

It is a cyclic number.

It is not a de Polignac number, because 443940631861 - 2¹ = 443940631859 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 (443940631811) 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, 4188119116 + ... + 4188119221.

It is an arithmetic number, because the mean of its divisors is an integer number (113079217563).

Almost surely, 2^443940631861 is an apocalyptic number.

It is an amenable number.

443940631861 is a deficient number, since it is larger than the sum of its proper divisors (8376238391).

443940631861 is an equidigital number, since it uses as much as digits as its factorization.

443940631861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8376238390.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 443940631861 in words is "four hundred forty-three billion, nine hundred forty million, six hundred thirty-one thousand, eight hundred sixty-one".