43648562731321 has 8 divisors (see below), whose sum is σ = 43714799149320. Its totient is φ = 43582331515008.

The previous prime is 43648562731303. The next prime is 43648562731399. The reversal of 43648562731321 is 12313726584634.

It can be written as a sum of positive squares in 4 ways, for example, as 33211754065296 + 10436808666025 = 5762964^2 + 3230605^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43648562731321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43648562731121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15662485 + ... + 18237613.

It is an arithmetic number, because the mean of its divisors is an integer number (5464349893665).

Almost surely, 2^{43648562731321} is an apocalyptic number.

It is an amenable number.

43648562731321 is a deficient number, since it is larger than the sum of its proper divisors (66236417999).

43648562731321 is a wasteful number, since it uses less digits than its factorization.

43648562731321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600843.

The product of its digits is 17418240, while the sum is 55.

The spelling of 43648562731321 in words is "forty-three trillion, six hundred forty-eight billion, five hundred sixty-two million, seven hundred thirty-one thousand, three hundred twenty-one".