2009578243 has 2 divisors, whose sum is σ = 2009578244. Its totient is φ = 2009578242.

The previous prime is 2009578159. The next prime is 2009578261. The reversal of 2009578243 is 3428759002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2009578243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2009578196 and 2009578205.

It is not a weakly prime, because it can be changed into another prime (2009578283) 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, 1004789121 + 1004789122.

It is an arithmetic number, because the mean of its divisors is an integer number (1004789122).

Almost surely, 2^2009578243 is an apocalyptic number.

2009578243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009578243 is an equidigital number, since it uses as much as digits as its factorization.

2009578243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 2009578243 is about 44828.3196539866. The cubic root of 2009578243 is about 1261.9291526119.

The spelling of 2009578243 in words is "two billion, nine million, five hundred seventy-eight thousand, two hundred forty-three".