681864271 has 16 divisors (see below), whose sum is σ = 789481728. Its totient is φ = 582025600.

The previous prime is 681864257. The next prime is 681864319. The reversal of 681864271 is 172468186.

It is not a de Polignac number, because 681864271 - 2¹³ = 681856079 is a prime.

It is a super-2 number, since 2×681864271² = 929877768132722882, which 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 (681864221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78726 + ... + 86956.

It is an arithmetic number, because the mean of its divisors is an integer number (49342608).

Almost surely, 2^681864271 is an apocalyptic number.

681864271 is a deficient number, since it is larger than the sum of its proper divisors (107617457).

681864271 is a wasteful number, since it uses less digits than its factorization.

681864271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8702.

The product of its digits is 129024, while the sum is 43.

The square root of 681864271 is about 26112.5309190817. The cubic root of 681864271 is about 880.1688170443.

The spelling of 681864271 in words is "six hundred eighty-one million, eight hundred sixty-four thousand, two hundred seventy-one".