8309881 has 2 divisors, whose sum is σ = 8309882. Its totient is φ = 8309880.

The previous prime is 8309869. The next prime is 8309909. The reversal of 8309881 is 1889038.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4665600 + 3644281 = 2160^2 + 1909^2 .

It is a cyclic number.

It is not a de Polignac number, because 8309881 - 2⁵ = 8309849 is a prime.

It is a super-2 number, since 2×8309881² = 138108244468322, which contains 22 as substring.

8309881 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8309881.

It is not a weakly prime, because it can be changed into another prime (8309381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4154940 + 4154941.

It is an arithmetic number, because the mean of its divisors is an integer number (4154941).

Almost surely, 2^8309881 is an apocalyptic number.

It is an amenable number.

8309881 is a deficient number, since it is larger than the sum of its proper divisors (1).

8309881 is an equidigital number, since it uses as much as digits as its factorization.

8309881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 8309881 is about 2882.6864206847. The cubic root of 8309881 is about 202.5496987197.

The spelling of 8309881 in words is "eight million, three hundred nine thousand, eight hundred eighty-one".