3891316084521 has 16 divisors (see below), whose sum is σ = 5193528392448. Its totient is φ = 2591657874000.

The previous prime is 3891316084507. The next prime is 3891316084541. The reversal of 3891316084521 is 1254806131983.

It is not a de Polignac number, because 3891316084521 - 2⁴¹ = 1692292828969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3891316084501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26316846 + ... + 26464296.

It is an arithmetic number, because the mean of its divisors is an integer number (324595524528).

Almost surely, 2^{3891316084521} is an apocalyptic number.

It is an amenable number.

3891316084521 is a deficient number, since it is larger than the sum of its proper divisors (1302212307927).

3891316084521 is a wasteful number, since it uses less digits than its factorization.

3891316084521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156052.

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 3891316084521 in words is "three trillion, eight hundred ninety-one billion, three hundred sixteen million, eighty-four thousand, five hundred twenty-one".