1311234215 has 4 divisors (see below), whose sum is σ = 1573481064. Its totient is φ = 1048987368.

The previous prime is 1311234203. The next prime is 1311234269. The reversal of 1311234215 is 5124321131.

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 1311234215 - 2¹⁰ = 1311233191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 131123417 + ... + 131123426.

It is an arithmetic number, because the mean of its divisors is an integer number (393370266).

Almost surely, 2^1311234215 is an apocalyptic number.

1311234215 is a deficient number, since it is larger than the sum of its proper divisors (262246849).

1311234215 is an equidigital number, since it uses as much as digits as its factorization.

1311234215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262246848.

The product of its digits is 720, while the sum is 23.

The square root of 1311234215 is about 36210.9681588328. The cubic root of 1311234215 is about 1094.5277016282.

Adding to 1311234215 its reverse (5124321131), we get a palindrome (6435555346).

The spelling of 1311234215 in words is "one billion, three hundred eleven million, two hundred thirty-four thousand, two hundred fifteen".