1668137 has 2 divisors, whose sum is σ = 1668138. Its totient is φ = 1668136.

The previous prime is 1668133. The next prime is 1668197. The reversal of 1668137 is 7318661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1577536 + 90601 = 1256^2 + 301^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668137 - 2² = 1668133 is a prime.

It is not a weakly prime, because it can be changed into another prime (1668131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834068 + 834069.

It is an arithmetic number, because the mean of its divisors is an integer number (834069).

2^1668137 is an apocalyptic number.

It is an amenable number.

1668137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668137 is an equidigital number, since it uses as much as digits as its factorization.

1668137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 1668137 is about 1291.5637808486. The cubic root of 1668137 is about 118.5979653605.

The spelling of 1668137 in words is "one million, six hundred sixty-eight thousand, one hundred thirty-seven".