209830273 has 2 divisors, whose sum is σ = 209830274. Its totient is φ = 209830272.

The previous prime is 209830267. The next prime is 209830277. The reversal of 209830273 is 372038902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174689089 + 35141184 = 13217^2 + 5928^2 .

It is a cyclic number.

It is not a de Polignac number, because 209830273 - 2¹⁷ = 209699201 is a prime.

It is equal to p_11592763 and since 209830273 and 11592763 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (209830277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104915136 + 104915137.

It is an arithmetic number, because the mean of its divisors is an integer number (104915137).

Almost surely, 2^209830273 is an apocalyptic number.

It is an amenable number.

209830273 is a deficient number, since it is larger than the sum of its proper divisors (1).

209830273 is an equidigital number, since it uses as much as digits as its factorization.

209830273 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 209830273 is about 14485.5194245840. The cubic root of 209830273 is about 594.2320181408.

The spelling of 209830273 in words is "two hundred nine million, eight hundred thirty thousand, two hundred seventy-three".