1205311103 has 8 divisors (see below), whose sum is σ = 1222958928. Its totient is φ = 1187694144.

The previous prime is 1205311091. The next prime is 1205311109. The reversal of 1205311103 is 3011135021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1205311103 - 2¹⁰ = 1205310079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205311109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77801 + ... + 91997.

It is an arithmetic number, because the mean of its divisors is an integer number (152869866).

Almost surely, 2^1205311103 is an apocalyptic number.

1205311103 is a deficient number, since it is larger than the sum of its proper divisors (17647825).

1205311103 is a wasteful number, since it uses less digits than its factorization.

1205311103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15433.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1205311103 is about 34717.5906854148. The cubic root of 1205311103 is about 1064.2240089222.

Adding to 1205311103 its reverse (3011135021), we get a palindrome (4216446124).

The spelling of 1205311103 in words is "one billion, two hundred five million, three hundred eleven thousand, one hundred three".