1311200213 has 4 divisors (see below), whose sum is σ = 1343180748. Its totient is φ = 1279219680.

The previous prime is 1311200173. The next prime is 1311200227. The reversal of 1311200213 is 3120021131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 256704484 + 1054495729 = 16022^2 + 32473^2 .

It is not a de Polignac number, because 1311200213 - 2⁸ = 1311199957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311200713) by changing a digit.

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, 15990206 + ... + 15990287.

It is an arithmetic number, because the mean of its divisors is an integer number (335795187).

Almost surely, 2^1311200213 is an apocalyptic number.

It is an amenable number.

1311200213 is a deficient number, since it is larger than the sum of its proper divisors (31980535).

1311200213 is an equidigital number, since it uses as much as digits as its factorization.

1311200213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31980534.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1311200213 is about 36210.4986571574. The cubic root of 1311200213 is about 1094.5182407066.

Adding to 1311200213 its reverse (3120021131), we get a palindrome (4431221344).

The spelling of 1311200213 in words is "one billion, three hundred eleven million, two hundred thousand, two hundred thirteen".