8631681 has 8 divisors (see below), whose sum is σ = 12114720. Its totient is φ = 5451552.

The previous prime is 8631673. The next prime is 8631713. The reversal of 8631681 is 1861368.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8631681 - 2³ = 8631673 is a prime.

It is a super-3 number, since 3×8631681³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

8631681 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8631611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75660 + ... + 75773.

It is an arithmetic number, because the mean of its divisors is an integer number (1514340).

Almost surely, 2^8631681 is an apocalyptic number.

It is an amenable number.

8631681 is a deficient number, since it is larger than the sum of its proper divisors (3483039).

8631681 is a wasteful number, since it uses less digits than its factorization.

8631681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151455.

The product of its digits is 6912, while the sum is 33.

The square root of 8631681 is about 2937.9722599099. The cubic root of 8631681 is about 205.1312346293.

The spelling of 8631681 in words is "eight million, six hundred thirty-one thousand, six hundred eighty-one".