1618909 has 2 divisors, whose sum is σ = 1618910. Its totient is φ = 1618908.

The previous prime is 1618891. The next prime is 1618931. The reversal of 1618909 is 9098161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 558009 = 1030^2 + 747^2 .

It is an emirp because it is prime and its reverse (9098161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1618909 - 2¹¹ = 1616861 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1618979) 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, 809454 + 809455.

It is an arithmetic number, because the mean of its divisors is an integer number (809455).

2^1618909 is an apocalyptic number.

It is an amenable number.

1618909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1618909 is an equidigital number, since it uses as much as digits as its factorization.

1618909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1618909 is about 1272.3635486762. The cubic root of 1618909 is about 117.4196583723.

The spelling of 1618909 in words is "one million, six hundred eighteen thousand, nine hundred nine".