209254973 has 2 divisors, whose sum is σ = 209254974. Its totient is φ = 209254972.

The previous prime is 209254957. The next prime is 209254987. The reversal of 209254973 is 379452902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191047684 + 18207289 = 13822^2 + 4267^2 .

It is a cyclic number.

It is not a de Polignac number, because 209254973 - 2⁴ = 209254957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 209254973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209254993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104627486 + 104627487.

It is an arithmetic number, because the mean of its divisors is an integer number (104627487).

Almost surely, 2^209254973 is an apocalyptic number.

It is an amenable number.

209254973 is a deficient number, since it is larger than the sum of its proper divisors (1).

209254973 is an equidigital number, since it uses as much as digits as its factorization.

209254973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 209254973 is about 14465.6480324941. The cubic root of 209254973 is about 593.6884445438.

The spelling of 209254973 in words is "two hundred nine million, two hundred fifty-four thousand, nine hundred seventy-three".