1165889 has 2 divisors, whose sum is σ = 1165890. Its totient is φ = 1165888.

The previous prime is 1165873. The next prime is 1165903. The reversal of 1165889 is 9885611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588289 + 577600 = 767^2 + 760^2 .

It is an emirp because it is prime and its reverse (9885611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1165889 - 2⁴ = 1165873 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1165819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582944 + 582945.

It is an arithmetic number, because the mean of its divisors is an integer number (582945).

2^1165889 is an apocalyptic number.

It is an amenable number.

1165889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165889 is an equidigital number, since it uses as much as digits as its factorization.

1165889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 38.

The square root of 1165889 is about 1079.7634000095. The cubic root of 1165889 is about 105.2492641794.

The spelling of 1165889 in words is "one million, one hundred sixty-five thousand, eight hundred eighty-nine".