43993791321 has 4 divisors (see below), whose sum is σ = 58658388432. Its totient is φ = 29329194212.

The previous prime is 43993791313. The next prime is 43993791349. The reversal of 43993791321 is 12319739934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43993791321 - 2³ = 43993791313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43993791301) 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, 7332298551 + ... + 7332298556.

It is an arithmetic number, because the mean of its divisors is an integer number (14664597108).

Almost surely, 2^43993791321 is an apocalyptic number.

It is an amenable number.

43993791321 is a deficient number, since it is larger than the sum of its proper divisors (14664597111).

43993791321 is a wasteful number, since it uses less digits than its factorization.

43993791321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14664597110.

The product of its digits is 1102248, while the sum is 51.

The spelling of 43993791321 in words is "forty-three billion, nine hundred ninety-three million, seven hundred ninety-one thousand, three hundred twenty-one".