138483209 has 2 divisors, whose sum is σ = 138483210. Its totient is φ = 138483208.

The previous prime is 138483187. The next prime is 138483217. The reversal of 138483209 is 902384831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102961609 + 35521600 = 10147^2 + 5960^2 .

It is an emirp because it is prime and its reverse (902384831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138483209 - 2¹⁶ = 138417673 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (138483239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69241604 + 69241605.

It is an arithmetic number, because the mean of its divisors is an integer number (69241605).

Almost surely, 2^138483209 is an apocalyptic number.

It is an amenable number.

138483209 is a deficient number, since it is larger than the sum of its proper divisors (1).

138483209 is an equidigital number, since it uses as much as digits as its factorization.

138483209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 138483209 is about 11767.8888930853. Note that the first 4 decimals coincide. The cubic root of 138483209 is about 517.3673759110.

The spelling of 138483209 in words is "one hundred thirty-eight million, four hundred eighty-three thousand, two hundred nine".