391171316487 has 32 divisors (see below), whose sum is σ = 600490329600. Its totient is φ = 221869767168.

The previous prime is 391171316479. The next prime is 391171316527. The reversal of 391171316487 is 784613171193.

It is not a de Polignac number, because 391171316487 - 2³ = 391171316479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391171317487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16500939 + ... + 16524627.

It is an arithmetic number, because the mean of its divisors is an integer number (18765322800).

Almost surely, 2^391171316487 is an apocalyptic number.

391171316487 is a deficient number, since it is larger than the sum of its proper divisors (209319013113).

391171316487 is a wasteful number, since it uses less digits than its factorization.

391171316487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29495.

The product of its digits is 762048, while the sum is 51.

The spelling of 391171316487 in words is "three hundred ninety-one billion, one hundred seventy-one million, three hundred sixteen thousand, four hundred eighty-seven".