1285871 has 2 divisors, whose sum is σ = 1285872. Its totient is φ = 1285870.

The previous prime is 1285859. The next prime is 1285877. The reversal of 1285871 is 1785821.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1785821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285871 - 2¹⁰ = 1284847 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642935 + 642936.

It is an arithmetic number, because the mean of its divisors is an integer number (642936).

2^1285871 is an apocalyptic number.

1285871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285871 is an equidigital number, since it uses as much as digits as its factorization.

1285871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 32.

The square root of 1285871 is about 1133.9625214265. The cubic root of 1285871 is about 108.7424551070.

The spelling of 1285871 in words is "one million, two hundred eighty-five thousand, eight hundred seventy-one".