1287071 has 2 divisors, whose sum is σ = 1287072. Its totient is φ = 1287070.

The previous prime is 1287067. The next prime is 1287101. The reversal of 1287071 is 1707821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1287071 - 2² = 1287067 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1287071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287061) 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, 643535 + 643536.

It is an arithmetic number, because the mean of its divisors is an integer number (643536).

2^1287071 is an apocalyptic number.

1287071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287071 is an equidigital number, since it uses as much as digits as its factorization.

1287071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 1287071 is about 1134.4915160547. The cubic root of 1287071 is about 108.7762714527.

The spelling of 1287071 in words is "one million, two hundred eighty-seven thousand, seventy-one".