3991321320301 has 10 divisors (see below), whose sum is σ = 4656264483502. Its totient is φ = 3421132558200.

The previous prime is 3991321320299. The next prime is 3991321320319. The reversal of 3991321320301 is 1030231231993.

3991321320301 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3986814883401 + 4506436900 = 1996701^2 + 67130^2 .

It is not a de Polignac number, because 3991321320301 - 2¹ = 3991321320299 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 (3991321320331) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 831176550 + ... + 831181351.

Almost surely, 2^{3991321320301} is an apocalyptic number.

It is an amenable number.

3991321320301 is a deficient number, since it is larger than the sum of its proper divisors (664943163201).

3991321320301 is an frugal number, since it uses more digits than its factorization.

3991321320301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662357929 (or 1662357908 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 37.

The spelling of 3991321320301 in words is "three trillion, nine hundred ninety-one billion, three hundred twenty-one million, three hundred twenty thousand, three hundred one".