1208930861 has 2 divisors, whose sum is σ = 1208930862. Its totient is φ = 1208930860.

The previous prime is 1208930783. The next prime is 1208930867. The reversal of 1208930861 is 1680398021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1100978761 + 107952100 = 33181^2 + 10390^2 .

It is an emirp because it is prime and its reverse (1680398021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1208930861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1208930867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604465430 + 604465431.

It is an arithmetic number, because the mean of its divisors is an integer number (604465431).

Almost surely, 2^1208930861 is an apocalyptic number.

It is an amenable number.

1208930861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1208930861 is an equidigital number, since it uses as much as digits as its factorization.

1208930861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1208930861 is about 34769.6830730451. The cubic root of 1208930861 is about 1065.2882938949.

The spelling of 1208930861 in words is "one billion, two hundred eight million, nine hundred thirty thousand, eight hundred sixty-one".