1668361 has 2 divisors, whose sum is σ = 1668362. Its totient is φ = 1668360.

The previous prime is 1668347. The next prime is 1668379. The reversal of 1668361 is 1638661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 118336 = 1245^2 + 344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834180 + 834181.

It is an arithmetic number, because the mean of its divisors is an integer number (834181).

2^1668361 is an apocalyptic number.

It is an amenable number.

1668361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668361 is an equidigital number, since it uses as much as digits as its factorization.

1668361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 1668361 is about 1291.6504945224. The cubic root of 1668361 is about 118.6032736286.

The spelling of 1668361 in words is "one million, six hundred sixty-eight thousand, three hundred sixty-one".