1668313 has 2 divisors, whose sum is σ = 1668314. Its totient is φ = 1668312.

The previous prime is 1668307. The next prime is 1668319. The reversal of 1668313 is 3138661.

It is a balanced prime because it is at equal distance from previous prime (1668307) and next prime (1668319).

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 559504 = 1053^2 + 748^2 .

It is an emirp because it is prime and its reverse (3138661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1668313 - 2¹³ = 1660121 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1668319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834156 + 834157.

It is an arithmetic number, because the mean of its divisors is an integer number (834157).

2^1668313 is an apocalyptic number.

It is an amenable number.

1668313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668313 is an equidigital number, since it uses as much as digits as its factorization.

1668313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 1668313 is about 1291.6319135110. The cubic root of 1668313 is about 118.6021361826.

The spelling of 1668313 in words is "one million, six hundred sixty-eight thousand, three hundred thirteen".