83723209 has 2 divisors, whose sum is σ = 83723210. Its totient is φ = 83723208.

The previous prime is 83723201. The next prime is 83723221. The reversal of 83723209 is 90232738.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46854025 + 36869184 = 6845^2 + 6072^2 .

It is a cyclic number.

It is not a de Polignac number, because 83723209 - 2³ = 83723201 is a prime.

It is not a weakly prime, because it can be changed into another prime (83723201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41861604 + 41861605.

It is an arithmetic number, because the mean of its divisors is an integer number (41861605).

Almost surely, 2^83723209 is an apocalyptic number.

It is an amenable number.

83723209 is a deficient number, since it is larger than the sum of its proper divisors (1).

83723209 is an equidigital number, since it uses as much as digits as its factorization.

83723209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 83723209 is about 9150.0387430874. The cubic root of 83723209 is about 437.4703483577.

The spelling of 83723209 in words is "eighty-three million, seven hundred twenty-three thousand, two hundred nine".