1166861 has 2 divisors, whose sum is σ = 1166862. Its totient is φ = 1166860.

The previous prime is 1166857. The next prime is 1166903. The reversal of 1166861 is 1686611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 11236 = 1075^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166861 - 2² = 1166857 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 (1166801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583430 + 583431.

It is an arithmetic number, because the mean of its divisors is an integer number (583431).

2^1166861 is an apocalyptic number.

It is an amenable number.

1166861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166861 is an equidigital number, since it uses as much as digits as its factorization.

1166861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 1166861 is about 1080.2134048418. The cubic root of 1166861 is about 105.2785047755.

The spelling of 1166861 in words is "one million, one hundred sixty-six thousand, eight hundred sixty-one".