1289969 has 2 divisors, whose sum is σ = 1289970. Its totient is φ = 1289968.

The previous prime is 1289963. The next prime is 1289971. The reversal of 1289969 is 9699821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1129969 + 160000 = 1063^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1289969 - 2⁸ = 1289713 is a prime.

It is a super-2 number, since 2×1289969² = 3328040041922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1289971, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1289963) 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, 644984 + 644985.

It is an arithmetic number, because the mean of its divisors is an integer number (644985).

2^1289969 is an apocalyptic number.

It is an amenable number.

1289969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289969 is an equidigital number, since it uses as much as digits as its factorization.

1289969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The square root of 1289969 is about 1135.7680220890. The cubic root of 1289969 is about 108.8578513434.

The spelling of 1289969 in words is "one million, two hundred eighty-nine thousand, nine hundred sixty-nine".