1311244201 has 4 divisors (see below), whose sum is σ = 1312950100. Its totient is φ = 1309538304.

The previous prime is 1311244199. The next prime is 1311244213. The reversal of 1311244201 is 1024421131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1024421131 = 109 ⋅9398359.

It can be written as a sum of positive squares in 2 ways, for example, as 962488576 + 348755625 = 31024^2 + 18675^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311244201 - 2¹ = 1311244199 is a prime.

It is a super-2 number, since 2×1311244201² = 3438722709312256802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311244241) 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, 851796 + ... + 853333.

It is an arithmetic number, because the mean of its divisors is an integer number (328237525).

Almost surely, 2^1311244201 is an apocalyptic number.

It is an amenable number.

1311244201 is a deficient number, since it is larger than the sum of its proper divisors (1705899).

1311244201 is an equidigital number, since it uses as much as digits as its factorization.

1311244201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705898.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1311244201 is about 36211.1060449691. The cubic root of 1311244201 is about 1094.5304801621.

Adding to 1311244201 its reverse (1024421131), we get a palindrome (2335665332).

The spelling of 1311244201 in words is "one billion, three hundred eleven million, two hundred forty-four thousand, two hundred one".