209941073 has 2 divisors, whose sum is σ = 209941074. Its totient is φ = 209941072.

The previous prime is 209941049. The next prime is 209941117. The reversal of 209941073 is 370149902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209467729 + 473344 = 14473^2 + 688^2 .

It is a cyclic number.

It is not a de Polignac number, because 209941073 - 2⁶ = 209941009 is a prime.

It is not a weakly prime, because it can be changed into another prime (209941573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104970536 + 104970537.

It is an arithmetic number, because the mean of its divisors is an integer number (104970537).

Almost surely, 2^209941073 is an apocalyptic number.

It is an amenable number.

209941073 is a deficient number, since it is larger than the sum of its proper divisors (1).

209941073 is an equidigital number, since it uses as much as digits as its factorization.

209941073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 209941073 is about 14489.3434288790. The cubic root of 209941073 is about 594.3365936485.

The spelling of 209941073 in words is "two hundred nine million, nine hundred forty-one thousand, seventy-three".