1311211103 has 4 divisors (see below), whose sum is σ = 1333435080. Its totient is φ = 1288987128.

The previous prime is 1311211079. The next prime is 1311211157. The reversal of 1311211103 is 3011121131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3011121131 = 5807 ⋅518533.

It is a cyclic number.

It is not a de Polignac number, because 1311211103 - 2¹⁰ = 1311210079 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 (1311211303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11111900 + ... + 11112017.

It is an arithmetic number, because the mean of its divisors is an integer number (333358770).

Almost surely, 2^1311211103 is an apocalyptic number.

1311211103 is a deficient number, since it is larger than the sum of its proper divisors (22223977).

1311211103 is an equidigital number, since it uses as much as digits as its factorization.

1311211103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22223976.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1311211103 is about 36210.6490275996. The cubic root of 1311211103 is about 1094.5212708237.

Adding to 1311211103 its reverse (3011121131), we get a palindrome (4322332234).

The spelling of 1311211103 in words is "one billion, three hundred eleven million, two hundred eleven thousand, one hundred three".