8531421 has 8 divisors (see below), whose sum is σ = 11412384. Its totient is φ = 5669040.

The previous prime is 8531407. The next prime is 8531429. The reversal of 8531421 is 1241358.

8531421 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 8531421 - 2⁵ = 8531389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8531391 and 8531400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8531429) 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, 3535 + ... + 5436.

It is an arithmetic number, because the mean of its divisors is an integer number (1426548).

Almost surely, 2^8531421 is an apocalyptic number.

It is an amenable number.

8531421 is a deficient number, since it is larger than the sum of its proper divisors (2880963).

8531421 is a wasteful number, since it uses less digits than its factorization.

8531421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9291.

The product of its digits is 960, while the sum is 24.

The square root of 8531421 is about 2920.8596337380. The cubic root of 8531421 is about 204.3339158408. Note that the first 3 decimals are identical.

Adding to 8531421 its reverse (1241358), we get a palindrome (9772779).

The spelling of 8531421 in words is "eight million, five hundred thirty-one thousand, four hundred twenty-one".