8631861 has 8 divisors (see below), whose sum is σ = 13153344. Its totient is φ = 4932480.

The previous prime is 8631851. The next prime is 8631881. The reversal of 8631861 is 1681368.

8631861 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 8631861 - 2¹⁰ = 8630837 is a prime.

8631861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8631851) 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, 205500 + ... + 205541.

It is an arithmetic number, because the mean of its divisors is an integer number (1644168).

Almost surely, 2^8631861 is an apocalyptic number.

It is an amenable number.

8631861 is a deficient number, since it is larger than the sum of its proper divisors (4521483).

8631861 is a wasteful number, since it uses less digits than its factorization.

8631861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411051.

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

The square root of 8631861 is about 2938.0028931232. The cubic root of 8631861 is about 205.1326605147.

The spelling of 8631861 in words is "eight million, six hundred thirty-one thousand, eight hundred sixty-one".