1311287 has 2 divisors, whose sum is σ = 1311288. Its totient is φ = 1311286.

The previous prime is 1311263. The next prime is 1311301. The reversal of 1311287 is 7821131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311287 - 2⁶ = 1311223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655643 + 655644.

It is an arithmetic number, because the mean of its divisors is an integer number (655644).

2^1311287 is an apocalyptic number.

1311287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311287 is an equidigital number, since it uses as much as digits as its factorization.

1311287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 23.

The square root of 1311287 is about 1145.1144047649. The cubic root of 1311287 is about 109.4542388521.

The spelling of 1311287 in words is "one million, three hundred eleven thousand, two hundred eighty-seven".