1905330209 has 2 divisors, whose sum is σ = 1905330210. Its totient is φ = 1905330208.

The previous prime is 1905330197. The next prime is 1905330253. The reversal of 1905330209 is 9020335091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1125803809 + 779526400 = 33553^2 + 27920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1905330209 - 2¹² = 1905326113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1905330289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952665104 + 952665105.

It is an arithmetic number, because the mean of its divisors is an integer number (952665105).

Almost surely, 2^1905330209 is an apocalyptic number.

It is an amenable number.

1905330209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1905330209 is an equidigital number, since it uses as much as digits as its factorization.

1905330209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 1905330209 is about 43650.0883046071. The cubic root of 1905330209 is about 1239.7194580827.

The spelling of 1905330209 in words is "one billion, nine hundred five million, three hundred thirty thousand, two hundred nine".