2009523889 has 2 divisors, whose sum is σ = 2009523890. Its totient is φ = 2009523888.

The previous prime is 2009523851. The next prime is 2009523899. The reversal of 2009523889 is 9883259002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2008563489 + 960400 = 44817^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009523889 - 2⁹ = 2009523377 is a prime.

It is not a weakly prime, because it can be changed into another prime (2009523899) 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, 1004761944 + 1004761945.

It is an arithmetic number, because the mean of its divisors is an integer number (1004761945).

Almost surely, 2^2009523889 is an apocalyptic number.

It is an amenable number.

2009523889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009523889 is an equidigital number, since it uses as much as digits as its factorization.

2009523889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 2009523889 is about 44827.7134036524. The cubic root of 2009523889 is about 1261.9177751805.

The spelling of 2009523889 in words is "two billion, nine million, five hundred twenty-three thousand, eight hundred eighty-nine".