43551320443 has 4 divisors (see below), whose sum is σ = 46113162840. Its totient is φ = 40989478048.

The previous prime is 43551320437. The next prime is 43551320557. The reversal of 43551320443 is 34402315534.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43551320443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43551320399 and 43551320408.

It is not an unprimeable number, because it can be changed into a prime (43551320143) 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, 1280921173 + ... + 1280921206.

It is an arithmetic number, because the mean of its divisors is an integer number (11528290710).

Almost surely, 2^43551320443 is an apocalyptic number.

43551320443 is a deficient number, since it is larger than the sum of its proper divisors (2561842397).

43551320443 is a wasteful number, since it uses less digits than its factorization.

43551320443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561842396.

The product of its (nonzero) digits is 86400, while the sum is 34.

Adding to 43551320443 its reverse (34402315534), we get a palindrome (77953635977).

The spelling of 43551320443 in words is "forty-three billion, five hundred fifty-one million, three hundred twenty thousand, four hundred forty-three".