209723089 has 2 divisors, whose sum is σ = 209723090. Its totient is φ = 209723088.

The previous prime is 209723053. The next prime is 209723119. The reversal of 209723089 is 980327902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206410689 + 3312400 = 14367^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 209723089 - 2¹¹ = 209721041 is a prime.

It is not a weakly prime, because it can be changed into another prime (209723489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104861544 + 104861545.

It is an arithmetic number, because the mean of its divisors is an integer number (104861545).

Almost surely, 2^209723089 is an apocalyptic number.

It is an amenable number.

209723089 is a deficient number, since it is larger than the sum of its proper divisors (1).

209723089 is an equidigital number, since it uses as much as digits as its factorization.

209723089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 209723089 is about 14481.8192572618. The cubic root of 209723089 is about 594.1308204573.

The spelling of 209723089 in words is "two hundred nine million, seven hundred twenty-three thousand, eighty-nine".