8143085861 has 2 divisors, whose sum is σ = 8143085862. Its totient is φ = 8143085860.

The previous prime is 8143085851. The next prime is 8143085869. The reversal of 8143085861 is 1685803418.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4546804900 + 3596280961 = 67430^2 + 59969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8143085861 is a prime.

It is a super-2 number, since 2×8143085861² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8143085869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4071542930 + 4071542931.

It is an arithmetic number, because the mean of its divisors is an integer number (4071542931).

Almost surely, 2^8143085861 is an apocalyptic number.

It is an amenable number.

8143085861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8143085861 is an equidigital number, since it uses as much as digits as its factorization.

8143085861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 8143085861 is about 90239.0484269421. The cubic root of 8143085861 is about 2011.8534310485.

The spelling of 8143085861 in words is "eight billion, one hundred forty-three million, eighty-five thousand, eight hundred sixty-one".