1311999851 has 2 divisors, whose sum is σ = 1311999852. Its totient is φ = 1311999850.

The previous prime is 1311999823. The next prime is 1311999901. The reversal of 1311999851 is 1589991131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311999851 - 2¹⁰ = 1311998827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311999796 and 1311999805.

It is not a weakly prime, because it can be changed into another prime (1311999151) 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 as a sum of consecutive naturals, namely, 655999925 + 655999926.

It is an arithmetic number, because the mean of its divisors is an integer number (655999926).

Almost surely, 2^1311999851 is an apocalyptic number.

1311999851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311999851 is an equidigital number, since it uses as much as digits as its factorization.

1311999851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 47.

The square root of 1311999851 is about 36221.5384957624. The cubic root of 1311999851 is about 1094.7406935175.

The spelling of 1311999851 in words is "one billion, three hundred eleven million, nine hundred ninety-nine thousand, eight hundred fifty-one".