1311201013 has 2 divisors, whose sum is σ = 1311201014. Its totient is φ = 1311201012.

The previous prime is 1311201011. The next prime is 1311201061. The reversal of 1311201013 is 3101021131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1097398129 + 213802884 = 33127^2 + 14622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311201013 - 2¹ = 1311201011 is a prime.

Together with 1311201011, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1311200984 and 1311201002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311201011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655600506 + 655600507.

It is an arithmetic number, because the mean of its divisors is an integer number (655600507).

Almost surely, 2^1311201013 is an apocalyptic number.

It is an amenable number.

1311201013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311201013 is an equidigital number, since it uses as much as digits as its factorization.

1311201013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1311201013 is about 36210.5097036758. The cubic root of 1311201013 is about 1094.5184633053.

Adding to 1311201013 its reverse (3101021131), we get a palindrome (4412222144).

The spelling of 1311201013 in words is "one billion, three hundred eleven million, two hundred one thousand, thirteen".