8118281861 has 2 divisors, whose sum is σ = 8118281862. Its totient is φ = 8118281860.

The previous prime is 8118281839. The next prime is 8118281869. The reversal of 8118281861 is 1681828118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7498520836 + 619761025 = 86594^2 + 24895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8118281861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8118281869) 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, 4059140930 + 4059140931.

It is an arithmetic number, because the mean of its divisors is an integer number (4059140931).

Almost surely, 2^8118281861 is an apocalyptic number.

It is an amenable number.

8118281861 is a deficient number, since it is larger than the sum of its proper divisors (1).

8118281861 is an equidigital number, since it uses as much as digits as its factorization.

8118281861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49152, while the sum is 44.

The square root of 8118281861 is about 90101.5086499666. The cubic root of 8118281861 is about 2009.8086384160.

The spelling of 8118281861 in words is "eight billion, one hundred eighteen million, two hundred eighty-one thousand, eight hundred sixty-one".