2685831871 has 4 divisors (see below), whose sum is σ = 2698561144. Its totient is φ = 2673102600.

The previous prime is 2685831859. The next prime is 2685831899. The reversal of 2685831871 is 1781385862.

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 2685831871 - 2²¹ = 2683734719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685831821) 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, 6364320 + ... + 6364741.

It is an arithmetic number, because the mean of its divisors is an integer number (674640286).

Almost surely, 2^2685831871 is an apocalyptic number.

2685831871 is a deficient number, since it is larger than the sum of its proper divisors (12729273).

2685831871 is a wasteful number, since it uses less digits than its factorization.

2685831871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12729272.

The product of its digits is 645120, while the sum is 49.

The square root of 2685831871 is about 51825.0120212239. The cubic root of 2685831871 is about 1390.0367243545.

The spelling of 2685831871 in words is "two billion, six hundred eighty-five million, eight hundred thirty-one thousand, eight hundred seventy-one".