1289881 has 2 divisors, whose sum is σ = 1289882. Its totient is φ = 1289880.

The previous prime is 1289867. The next prime is 1289921. The reversal of 1289881 is 1889821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 46656 = 1115^2 + 216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1289881 - 2⁷ = 1289753 is a prime.

It is a super-2 number, since 2×1289881² = 3327585988322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1289881.

It is not a weakly prime, because it can be changed into another prime (1289801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644940 + 644941.

It is an arithmetic number, because the mean of its divisors is an integer number (644941).

2^1289881 is an apocalyptic number.

It is an amenable number.

1289881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289881 is an equidigital number, since it uses as much as digits as its factorization.

1289881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 37.

The square root of 1289881 is about 1135.7292811229. The cubic root of 1289881 is about 108.8553759069.

The spelling of 1289881 in words is "one million, two hundred eighty-nine thousand, eight hundred eighty-one".