1205105099 has 4 divisors (see below), whose sum is σ = 1314660120. Its totient is φ = 1095550080.

The previous prime is 1205105089. The next prime is 1205105113. The reversal of 1205105099 is 9905015021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205105099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1205105009) 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 in 3 ways as a sum of consecutive naturals, for example, 54777494 + ... + 54777515.

It is an arithmetic number, because the mean of its divisors is an integer number (328665030).

Almost surely, 2^1205105099 is an apocalyptic number.

1205105099 is a deficient number, since it is larger than the sum of its proper divisors (109555021).

1205105099 is a wasteful number, since it uses less digits than its factorization.

1205105099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109555020.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 1205105099 is about 34714.6237052917. The cubic root of 1205105099 is about 1064.1633753664.

The spelling of 1205105099 in words is "one billion, two hundred five million, one hundred five thousand, ninety-nine".