8631421 has 8 divisors (see below), whose sum is σ = 8861400. Its totient is φ = 8404032.

The previous prime is 8631401. The next prime is 8631451. The reversal of 8631421 is 1241368.

8631421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2924100 + 5707321 = 1710^2 + 2389^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8631421 - 2¹⁹ = 8107133 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 (8631401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7351 + ... + 8443.

It is an arithmetic number, because the mean of its divisors is an integer number (1107675).

Almost surely, 2^8631421 is an apocalyptic number.

It is an amenable number.

8631421 is a deficient number, since it is larger than the sum of its proper divisors (229979).

8631421 is a wasteful number, since it uses less digits than its factorization.

8631421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295.

The product of its digits is 1152, while the sum is 25.

The square root of 8631421 is about 2937.9280113713. The cubic root of 8631421 is about 205.1291749819.

Adding to 8631421 its reverse (1241368), we get a palindrome (9872789).

The spelling of 8631421 in words is "eight million, six hundred thirty-one thousand, four hundred twenty-one".