1027808861 has 2 divisors, whose sum is σ = 1027808862. Its totient is φ = 1027808860.

The previous prime is 1027808849. The next prime is 1027808867. The reversal of 1027808861 is 1688087201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787868761 + 239940100 = 28069^2 + 15490^2 .

It is an emirp because it is prime and its reverse (1688087201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1027808861 is a prime.

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 (1027808867) 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, 513904430 + 513904431.

It is an arithmetic number, because the mean of its divisors is an integer number (513904431).

Almost surely, 2^1027808861 is an apocalyptic number.

It is an amenable number.

1027808861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1027808861 is an equidigital number, since it uses as much as digits as its factorization.

1027808861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 41.

The square root of 1027808861 is about 32059.4582143866. The cubic root of 1027808861 is about 1009.1849978528.

The spelling of 1027808861 in words is "one billion, twenty-seven million, eight hundred eight thousand, eight hundred sixty-one".