8531881 has 2 divisors, whose sum is σ = 8531882. Its totient is φ = 8531880.

The previous prime is 8531879. The next prime is 8531903. The reversal of 8531881 is 1881358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8265625 + 266256 = 2875^2 + 516^2 .

It is a cyclic number.

It is not a de Polignac number, because 8531881 - 2¹ = 8531879 is a prime.

It is a super-2 number, since 2×8531881² = 145585986796322, which contains 22 as substring.

Together with 8531879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8531801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4265940 + 4265941.

It is an arithmetic number, because the mean of its divisors is an integer number (4265941).

Almost surely, 2^8531881 is an apocalyptic number.

It is an amenable number.

8531881 is a deficient number, since it is larger than the sum of its proper divisors (1).

8531881 is an equidigital number, since it uses as much as digits as its factorization.

8531881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 34.

The square root of 8531881 is about 2920.9383766180. The cubic root of 8531881 is about 204.3375882229.

The spelling of 8531881 in words is "eight million, five hundred thirty-one thousand, eight hundred eighty-one".