43321512961 has 4 divisors (see below), whose sum is σ = 44138900052. Its totient is φ = 42504125872.

The previous prime is 43321512953. The next prime is 43321512977. The reversal of 43321512961 is 16921512334.

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 34056487936 + 9265025025 = 184544^2 + 96255^2 .

It is a cyclic number.

It is not a de Polignac number, because 43321512961 - 2³ = 43321512953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43321512961.

It is not an unprimeable number, because it can be changed into a prime (43321512361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408693466 + ... + 408693571.

It is an arithmetic number, because the mean of its divisors is an integer number (11034725013).

Almost surely, 2^43321512961 is an apocalyptic number.

It is an amenable number.

43321512961 is a deficient number, since it is larger than the sum of its proper divisors (817387091).

43321512961 is an equidigital number, since it uses as much as digits as its factorization.

43321512961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817387090.

The product of its digits is 38880, while the sum is 37.

The spelling of 43321512961 in words is "forty-three billion, three hundred twenty-one million, five hundred twelve thousand, nine hundred sixty-one".