1305287 has 2 divisors, whose sum is σ = 1305288. Its totient is φ = 1305286.

The previous prime is 1305253. The next prime is 1305289. The reversal of 1305287 is 7825031.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1305287 - 2¹⁶ = 1239751 is a prime.

Together with 1305289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1305289) 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, 652643 + 652644.

It is an arithmetic number, because the mean of its divisors is an integer number (652644).

2^1305287 is an apocalyptic number.

1305287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1305287 is an equidigital number, since it uses as much as digits as its factorization.

1305287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1305287 is about 1142.4915754613. The cubic root of 1305287 is about 109.2870418827.

The spelling of 1305287 in words is "one million, three hundred five thousand, two hundred eighty-seven".