1311213103 has 4 divisors (see below), whose sum is σ = 1311431688. Its totient is φ = 1310994520.

The previous prime is 1311213083. The next prime is 1311213121. The reversal of 1311213103 is 3013121131.

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

It is a cyclic number.

It is not a de Polignac number, because 1311213103 - 2¹³ = 1311204911 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 (1311213133) 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, 100033 + ... + 112378.

It is an arithmetic number, because the mean of its divisors is an integer number (327857922).

Almost surely, 2^1311213103 is an apocalyptic number.

1311213103 is a deficient number, since it is larger than the sum of its proper divisors (218585).

1311213103 is an equidigital number, since it uses as much as digits as its factorization.

1311213103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218584.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1311213103 is about 36210.6766437746. The cubic root of 1311213103 is about 1094.5218273172.

Adding to 1311213103 its reverse (3013121131), we get a palindrome (4324334234).

The spelling of 1311213103 in words is "one billion, three hundred eleven million, two hundred thirteen thousand, one hundred three".