1289111 has 2 divisors, whose sum is σ = 1289112. Its totient is φ = 1289110.

The previous prime is 1289083. The next prime is 1289129. The reversal of 1289111 is 1119821.

It is a strong prime.

It is an emirp because it is prime and its reverse (1119821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1289111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1289411) 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, 644555 + 644556.

It is an arithmetic number, because the mean of its divisors is an integer number (644556).

2^1289111 is an apocalyptic number.

1289111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289111 is an equidigital number, since it uses as much as digits as its factorization.

1289111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 23.

The square root of 1289111 is about 1135.3902412827. The cubic root of 1289111 is about 108.8337110341.

The spelling of 1289111 in words is "one million, two hundred eighty-nine thousand, one hundred eleven".