3991321303013 has 4 divisors (see below), whose sum is σ = 4354168694208. Its totient is φ = 3628473911820.

The previous prime is 3991321302853. The next prime is 3991321303163. The reversal of 3991321303013 is 3103031231993.

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 3991321303013 - 2¹⁴ = 3991321286629 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 (3991321393013) 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, 181423695581 + ... + 181423695602.

It is an arithmetic number, because the mean of its divisors is an integer number (1088542173552).

Almost surely, 2^{3991321303013} is an apocalyptic number.

It is an amenable number.

3991321303013 is a deficient number, since it is larger than the sum of its proper divisors (362847391195).

3991321303013 is a wasteful number, since it uses less digits than its factorization.

3991321303013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362847391194.

The product of its (nonzero) digits is 39366, while the sum is 38.

The spelling of 3991321303013 in words is "three trillion, nine hundred ninety-one billion, three hundred twenty-one million, three hundred three thousand, thirteen".