1166021 has 2 divisors, whose sum is σ = 1166022. Its totient is φ = 1166020.

The previous prime is 1165993. The next prime is 1166027. The reversal of 1166021 is 1206611.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 835396 + 330625 = 914^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166021 - 2¹⁰ = 1164997 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 (1166027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583010 + 583011.

It is an arithmetic number, because the mean of its divisors is an integer number (583011).

2^1166021 is an apocalyptic number.

It is an amenable number.

1166021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166021 is an equidigital number, since it uses as much as digits as its factorization.

1166021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1166021 is about 1079.8245227814. The cubic root of 1166021 is about 105.2532360780.

The spelling of 1166021 in words is "one million, one hundred sixty-six thousand, twenty-one".