1909291243 has 2 divisors, whose sum is σ = 1909291244. Its totient is φ = 1909291242.

The previous prime is 1909291217. The next prime is 1909291261. The reversal of 1909291243 is 3421929091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1909291243 - 2¹⁷ = 1909160171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1909291196 and 1909291205.

It is not a weakly prime, because it can be changed into another prime (1909291213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954645621 + 954645622.

It is an arithmetic number, because the mean of its divisors is an integer number (954645622).

Almost surely, 2^1909291243 is an apocalyptic number.

1909291243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909291243 is an equidigital number, since it uses as much as digits as its factorization.

1909291243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 1909291243 is about 43695.4373247368. The cubic root of 1909291243 is about 1240.5779570324.

The spelling of 1909291243 in words is "one billion, nine hundred nine million, two hundred ninety-one thousand, two hundred forty-three".