1286881 has 2 divisors, whose sum is σ = 1286882. Its totient is φ = 1286880.

The previous prime is 1286843. The next prime is 1286939. The reversal of 1286881 is 1886821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819025 + 467856 = 905^2 + 684^2 .

It is an emirp because it is prime and its reverse (1886821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1286881 is a prime.

It is a super-2 number, since 2×1286881² = 3312125416322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1286821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643440 + 643441.

It is an arithmetic number, because the mean of its divisors is an integer number (643441).

2^1286881 is an apocalyptic number.

It is an amenable number.

1286881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286881 is an equidigital number, since it uses as much as digits as its factorization.

1286881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 34.

The square root of 1286881 is about 1134.4077750086. The cubic root of 1286881 is about 108.7709185989.

The spelling of 1286881 in words is "one million, two hundred eighty-six thousand, eight hundred eighty-one".