209208133 has 2 divisors, whose sum is σ = 209208134. Its totient is φ = 209208132.

The previous prime is 209208127. The next prime is 209208143. The reversal of 209208133 is 331802902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207878724 + 1329409 = 14418^2 + 1153^2 .

It is a cyclic number.

It is not a de Polignac number, because 209208133 - 2²⁵ = 175653701 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209208143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104604066 + 104604067.

It is an arithmetic number, because the mean of its divisors is an integer number (104604067).

Almost surely, 2^209208133 is an apocalyptic number.

It is an amenable number.

209208133 is a deficient number, since it is larger than the sum of its proper divisors (1).

209208133 is an equidigital number, since it uses as much as digits as its factorization.

209208133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 209208133 is about 14464.0289338759. The cubic root of 209208133 is about 593.6441438175.

The spelling of 209208133 in words is "two hundred nine million, two hundred eight thousand, one hundred thirty-three".