1660601 has 2 divisors, whose sum is σ = 1660602. Its totient is φ = 1660600.

The previous prime is 1660573. The next prime is 1660609. The reversal of 1660601 is 1060661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 22201 = 1280^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660601 - 2¹⁴ = 1644217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1660609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830300 + 830301.

It is an arithmetic number, because the mean of its divisors is an integer number (830301).

2^1660601 is an apocalyptic number.

It is an amenable number.

1660601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660601 is an equidigital number, since it uses as much as digits as its factorization.

1660601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1660601 is about 1288.6430847989. The cubic root of 1660601 is about 118.4191024465.

The spelling of 1660601 in words is "one million, six hundred sixty thousand, six hundred one".