209512073 has 2 divisors, whose sum is σ = 209512074. Its totient is φ = 209512072.

The previous prime is 209512067. The next prime is 209512081. The reversal of 209512073 is 370215902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157051024 + 52461049 = 12532^2 + 7243^2 .

It is a cyclic number.

It is not a de Polignac number, because 209512073 - 2¹⁶ = 209446537 is a prime.

It is not a weakly prime, because it can be changed into another prime (209512273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104756036 + 104756037.

It is an arithmetic number, because the mean of its divisors is an integer number (104756037).

Almost surely, 2^209512073 is an apocalyptic number.

It is an amenable number.

209512073 is a deficient number, since it is larger than the sum of its proper divisors (1).

209512073 is an equidigital number, since it uses as much as digits as its factorization.

209512073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 209512073 is about 14474.5318749865. The cubic root of 209512073 is about 593.9314890734.

Adding to 209512073 its reverse (370215902), we get a palindrome (579727975).

The spelling of 209512073 in words is "two hundred nine million, five hundred twelve thousand, seventy-three".