1205908213 has 2 divisors, whose sum is σ = 1205908214. Its totient is φ = 1205908212.

The previous prime is 1205908159. The next prime is 1205908229. The reversal of 1205908213 is 3128095021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 766293124 + 439615089 = 27682^2 + 20967^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205908213 - 2¹³ = 1205900021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205908513) 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, 602954106 + 602954107.

It is an arithmetic number, because the mean of its divisors is an integer number (602954107).

Almost surely, 2^1205908213 is an apocalyptic number.

It is an amenable number.

1205908213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205908213 is an equidigital number, since it uses as much as digits as its factorization.

1205908213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1205908213 is about 34726.1891517051. The cubic root of 1205908213 is about 1064.3997184382.

The spelling of 1205908213 in words is "one billion, two hundred five million, nine hundred eight thousand, two hundred thirteen".