1311113213 has 4 divisors (see below), whose sum is σ = 1311191868. Its totient is φ = 1311034560.

The previous prime is 1311113173. The next prime is 1311113233. The reversal of 1311113213 is 3123111131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 46812964 + 1264300249 = 6842^2 + 35557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311113213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311113191 and 1311113200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311113233) 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, 3356 + ... + 51317.

It is an arithmetic number, because the mean of its divisors is an integer number (327797967).

Almost surely, 2^1311113213 is an apocalyptic number.

It is an amenable number.

1311113213 is a deficient number, since it is larger than the sum of its proper divisors (78655).

1311113213 is an equidigital number, since it uses as much as digits as its factorization.

1311113213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78654.

The product of its digits is 54, while the sum is 17.

The square root of 1311113213 is about 36209.2973281725. The cubic root of 1311113213 is about 1094.4940325569.

Adding to 1311113213 its reverse (3123111131), we get a palindrome (4434224344).

The spelling of 1311113213 in words is "one billion, three hundred eleven million, one hundred thirteen thousand, two hundred thirteen".