391689310971 has 16 divisors (see below), whose sum is σ = 597246769664. Its totient is φ = 223677388224.

The previous prime is 391689310919. The next prime is 391689311011. The reversal of 391689310971 is 179013986193.

It is not a de Polignac number, because 391689310971 - 2⁹ = 391689310459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391689310171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6011626 + ... + 6076431.

It is an arithmetic number, because the mean of its divisors is an integer number (37327923104).

Almost surely, 2^391689310971 is an apocalyptic number.

391689310971 is a deficient number, since it is larger than the sum of its proper divisors (205557458693).

391689310971 is a wasteful number, since it uses less digits than its factorization.

391689310971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12089610.

The product of its (nonzero) digits is 2204496, while the sum is 57.

The spelling of 391689310971 in words is "three hundred ninety-one billion, six hundred eighty-nine million, three hundred ten thousand, nine hundred seventy-one".