1205983913 has 2 divisors, whose sum is σ = 1205983914. Its totient is φ = 1205983912.

The previous prime is 1205983897. The next prime is 1205983921. The reversal of 1205983913 is 3193895021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1204645264 + 1338649 = 34708^2 + 1157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205983913 - 2⁴ = 1205983897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1205983993) 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, 602991956 + 602991957.

It is an arithmetic number, because the mean of its divisors is an integer number (602991957).

Almost surely, 2^1205983913 is an apocalyptic number.

It is an amenable number.

1205983913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205983913 is an equidigital number, since it uses as much as digits as its factorization.

1205983913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 1205983913 is about 34727.2790900756. The cubic root of 1205983913 is about 1064.4219902749.

The spelling of 1205983913 in words is "one billion, two hundred five million, nine hundred eighty-three thousand, nine hundred thirteen".