1287199 has 2 divisors, whose sum is σ = 1287200. Its totient is φ = 1287198.

The previous prime is 1287197. The next prime is 1287217. The reversal of 1287199 is 9917821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1287199 - 2¹ = 1287197 is a prime.

Together with 1287197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643599 + 643600.

It is an arithmetic number, because the mean of its divisors is an integer number (643600).

2^1287199 is an apocalyptic number.

1287199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287199 is an equidigital number, since it uses as much as digits as its factorization.

1287199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 37.

The square root of 1287199 is about 1134.5479275905. The cubic root of 1287199 is about 108.7798772888.

The spelling of 1287199 in words is "one million, two hundred eighty-seven thousand, one hundred ninety-nine".