1165861 has 2 divisors, whose sum is σ = 1165862. Its totient is φ = 1165860.

The previous prime is 1165849. The next prime is 1165873. The reversal of 1165861 is 1685611.

It is a balanced prime because it is at equal distance from previous prime (1165849) and next prime (1165873).

It can be written as a sum of positive squares in only one way, i.e., 980100 + 185761 = 990^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165861 - 2⁹ = 1165349 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582930 + 582931.

It is an arithmetic number, because the mean of its divisors is an integer number (582931).

2^1165861 is an apocalyptic number.

It is an amenable number.

1165861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165861 is an equidigital number, since it uses as much as digits as its factorization.

1165861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 28.

The square root of 1165861 is about 1079.7504341282. The cubic root of 1165861 is about 105.2484216169.

The spelling of 1165861 in words is "one million, one hundred sixty-five thousand, eight hundred sixty-one".