1660361 has 4 divisors (see below), whose sum is σ = 1666512. Its totient is φ = 1654212.

The previous prime is 1660357. The next prime is 1660367. The reversal of 1660361 is 1630661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1630661 = 727 ⋅2243.

It is a cyclic number.

It is not a de Polignac number, because 1660361 - 2² = 1660357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651 + ... + 3216.

It is an arithmetic number, because the mean of its divisors is an integer number (416628).

2^1660361 is an apocalyptic number.

It is an amenable number.

1660361 is a deficient number, since it is larger than the sum of its proper divisors (6151).

1660361 is an equidigital number, since it uses as much as digits as its factorization.

1660361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6150.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1660361 is about 1288.5499602266. The cubic root of 1660361 is about 118.4133972924.

The spelling of 1660361 in words is "one million, six hundred sixty thousand, three hundred sixty-one".