1311899 has 2 divisors, whose sum is σ = 1311900. Its totient is φ = 1311898.

The previous prime is 1311857. The next prime is 1311901. The reversal of 1311899 is 9981131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311899 - 2⁸ = 1311643 is a prime.

Together with 1311901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1311829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655949 + 655950.

It is an arithmetic number, because the mean of its divisors is an integer number (655950).

2^1311899 is an apocalyptic number.

1311899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311899 is an equidigital number, since it uses as much as digits as its factorization.

1311899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 32.

The square root of 1311899 is about 1145.3815958012. The cubic root of 1311899 is about 109.4712642569.

The spelling of 1311899 in words is "one million, three hundred eleven thousand, eight hundred ninety-nine".