3947370937491 has 4 divisors (see below), whose sum is σ = 5263161249992. Its totient is φ = 2631580624992.

The previous prime is 3947370937397. The next prime is 3947370937507. The reversal of 3947370937491 is 1947390737493.

3947370937491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3947370937491 - 2²⁶ = 3947303828627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3947370936491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 657895156246 + ... + 657895156251.

It is an arithmetic number, because the mean of its divisors is an integer number (1315790312498).

Almost surely, 2^{3947370937491} is an apocalyptic number.

3947370937491 is a deficient number, since it is larger than the sum of its proper divisors (1315790312501).

3947370937491 is a wasteful number, since it uses less digits than its factorization.

3947370937491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315790312500.

The product of its (nonzero) digits is 108020304, while the sum is 66.

The spelling of 3947370937491 in words is "three trillion, nine hundred forty-seven billion, three hundred seventy million, nine hundred thirty-seven thousand, four hundred ninety-one".