1311599 has 2 divisors, whose sum is σ = 1311600. Its totient is φ = 1311598.

The previous prime is 1311577. The next prime is 1311617. The reversal of 1311599 is 9951131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311599 - 2²⁰ = 263023 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655799 + 655800.

It is an arithmetic number, because the mean of its divisors is an integer number (655800).

2^1311599 is an apocalyptic number.

1311599 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311599 is an equidigital number, since it uses as much as digits as its factorization.

1311599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1215, while the sum is 29.

The square root of 1311599 is about 1145.2506275921. The cubic root of 1311599 is about 109.4629191320.

The spelling of 1311599 in words is "one million, three hundred eleven thousand, five hundred ninety-nine".