391346066171 has 4 divisors (see below), whose sum is σ = 393838716432. Its totient is φ = 388853415912.

The previous prime is 391346066147. The next prime is 391346066203. The reversal of 391346066171 is 171660643193.

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

It is a cyclic number.

It is not a de Polignac number, because 391346066171 - 2⁶ = 391346066107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391346066101) 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, 1246324895 + ... + 1246325208.

It is an arithmetic number, because the mean of its divisors is an integer number (98459679108).

Almost surely, 2^391346066171 is an apocalyptic number.

391346066171 is a deficient number, since it is larger than the sum of its proper divisors (2492650261).

391346066171 is a wasteful number, since it uses less digits than its factorization.

391346066171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2492650260.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 391346066171 in words is "three hundred ninety-one billion, three hundred forty-six million, sixty-six thousand, one hundred seventy-one".