1311202117 has 2 divisors, whose sum is σ = 1311202118. Its totient is φ = 1311202116.

The previous prime is 1311202111. The next prime is 1311202157. The reversal of 1311202117 is 7112021131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1248491556 + 62710561 = 35334^2 + 7919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311202117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311202094 and 1311202103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311202111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655601058 + 655601059.

It is an arithmetic number, because the mean of its divisors is an integer number (655601059).

Almost surely, 2^1311202117 is an apocalyptic number.

It is an amenable number.

1311202117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311202117 is an equidigital number, since it uses as much as digits as its factorization.

1311202117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 1311202117 is about 36210.5249478656. The cubic root of 1311202117 is about 1094.5187704913.

Adding to 1311202117 its reverse (7112021131), we get a palindrome (8423223248).

The spelling of 1311202117 in words is "one billion, three hundred eleven million, two hundred two thousand, one hundred seventeen".