1311134857 has 2 divisors, whose sum is σ = 1311134858. Its totient is φ = 1311134856.

The previous prime is 1311134831. The next prime is 1311134899. The reversal of 1311134857 is 7584311131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 834978816 + 476156041 = 28896^2 + 21821^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311134857 - 2¹⁹ = 1310610569 is a prime.

It is a super-2 number, since 2×1311134857² = 3438149226480820898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1311134807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655567428 + 655567429.

It is an arithmetic number, because the mean of its divisors is an integer number (655567429).

Almost surely, 2^1311134857 is an apocalyptic number.

It is an amenable number.

1311134857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311134857 is an equidigital number, since it uses as much as digits as its factorization.

1311134857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 1311134857 is about 36209.5962004549. The cubic root of 1311134857 is about 1094.5000551994.

Adding to 1311134857 its reverse (7584311131), we get a palindrome (8895445988).

The spelling of 1311134857 in words is "one billion, three hundred eleven million, one hundred thirty-four thousand, eight hundred fifty-seven".