8221831 has 2 divisors, whose sum is σ = 8221832. Its totient is φ = 8221830.

The previous prime is 8221823. The next prime is 8221841. The reversal of 8221831 is 1381228.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8221831 - 2³ = 8221823 is a prime.

It is a super-2 number, since 2×8221831² = 135197009985122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8221796 and 8221805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8221841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110915 + 4110916.

It is an arithmetic number, because the mean of its divisors is an integer number (4110916).

Almost surely, 2^8221831 is an apocalyptic number.

8221831 is a deficient number, since it is larger than the sum of its proper divisors (1).

8221831 is an equidigital number, since it uses as much as digits as its factorization.

8221831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 8221831 is about 2867.3735368800. The cubic root of 8221831 is about 201.8317636577.

The spelling of 8221831 in words is "eight million, two hundred twenty-one thousand, eight hundred thirty-one".