1166401 has 2 divisors, whose sum is σ = 1166402. Its totient is φ = 1166400.

The previous prime is 1166393. The next prime is 1166411. The reversal of 1166401 is 1046611.

It is a happy number.

It is a Cunningham number, because it is equal to 1080²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1166400 + 1 = 1080^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166401 - 2³ = 1166393 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1166411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583200 + 583201.

It is an arithmetic number, because the mean of its divisors is an integer number (583201).

2^1166401 is an apocalyptic number.

It is an amenable number.

1166401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166401 is an equidigital number, since it uses as much as digits as its factorization.

1166401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1166401 is about 1080.0004629629. Note that the first 3 decimals coincide. The cubic root of 1166401 is about 105.2646686581.

The spelling of 1166401 in words is "one million, one hundred sixty-six thousand, four hundred one".