1289231 has 2 divisors, whose sum is σ = 1289232. Its totient is φ = 1289230.

The previous prime is 1289213. The next prime is 1289237. The reversal of 1289231 is 1329821.

Together with previous prime (1289213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1289231 - 2¹⁴ = 1272847 is a prime.

It is a super-2 number, since 2×1289231² = 3324233142722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1289231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1289237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644615 + 644616.

It is an arithmetic number, because the mean of its divisors is an integer number (644616).

2^1289231 is an apocalyptic number.

1289231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289231 is an equidigital number, since it uses as much as digits as its factorization.

1289231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 1289231 is about 1135.4430853196. The cubic root of 1289231 is about 108.8370879453.

The spelling of 1289231 in words is "one million, two hundred eighty-nine thousand, two hundred thirty-one".