391935483871 has 4 divisors (see below), whose sum is σ = 414990512352. Its totient is φ = 368880455392.

The previous prime is 391935483857. The next prime is 391935483941. The reversal of 391935483871 is 178384539193.

It is a happy number.

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 391935483871 - 2⁵ = 391935483839 is a prime.

It is a super-2 number, since 2×391935483871² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391935489871) 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, 11527514215 + ... + 11527514248.

It is an arithmetic number, because the mean of its divisors is an integer number (103747628088).

Almost surely, 2^391935483871 is an apocalyptic number.

391935483871 is a deficient number, since it is larger than the sum of its proper divisors (23055028481).

391935483871 is a wasteful number, since it uses less digits than its factorization.

391935483871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23055028480.

The product of its digits is 19595520, while the sum is 61.

The spelling of 391935483871 in words is "three hundred ninety-one billion, nine hundred thirty-five million, four hundred eighty-three thousand, eight hundred seventy-one".