1205117099 has 2 divisors, whose sum is σ = 1205117100. Its totient is φ = 1205117098.

The previous prime is 1205117093. The next prime is 1205117107. The reversal of 1205117099 is 9907115021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1205117099 - 2¹⁶ = 1205051563 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1205117093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602558549 + 602558550.

It is an arithmetic number, because the mean of its divisors is an integer number (602558550).

Almost surely, 2^1205117099 is an apocalyptic number.

1205117099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205117099 is an equidigital number, since it uses as much as digits as its factorization.

1205117099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 35.

The square root of 1205117099 is about 34714.7965426848. The cubic root of 1205117099 is about 1064.1669075391.

The spelling of 1205117099 in words is "one billion, two hundred five million, one hundred seventeen thousand, ninety-nine".