1669813 has 2 divisors, whose sum is σ = 1669814. Its totient is φ = 1669812.

The previous prime is 1669799. The next prime is 1669817. The reversal of 1669813 is 3189661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1620529 + 49284 = 1273^2 + 222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669813 - 2⁵ = 1669781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834906 + 834907.

It is an arithmetic number, because the mean of its divisors is an integer number (834907).

2^1669813 is an apocalyptic number.

It is an amenable number.

1669813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669813 is an equidigital number, since it uses as much as digits as its factorization.

1669813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 1669813 is about 1292.2124438342. The cubic root of 1669813 is about 118.6376710637.

The spelling of 1669813 in words is "one million, six hundred sixty-nine thousand, eight hundred thirteen".