1286189 has 2 divisors, whose sum is σ = 1286190. Its totient is φ = 1286188.

The previous prime is 1286177. The next prime is 1286191. The reversal of 1286189 is 9816821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1283689 + 2500 = 1133^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 1286189 - 2¹² = 1282093 is a prime.

It is a Sophie Germain prime.

Together with 1286191, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1286119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643094 + 643095.

It is an arithmetic number, because the mean of its divisors is an integer number (643095).

2^1286189 is an apocalyptic number.

It is an amenable number.

1286189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286189 is an equidigital number, since it uses as much as digits as its factorization.

1286189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 35.

The square root of 1286189 is about 1134.1027290330. The cubic root of 1286189 is about 108.7514184868.

The spelling of 1286189 in words is "one million, two hundred eighty-six thousand, one hundred eighty-nine".