209053261 has 2 divisors, whose sum is σ = 209053262. Its totient is φ = 209053260.

The previous prime is 209053259. The next prime is 209053291. The reversal of 209053261 is 162350902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152893225 + 56160036 = 12365^2 + 7494^2 .

It is a cyclic number.

It is not a de Polignac number, because 209053261 - 2¹ = 209053259 is a prime.

Together with 209053259, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209053211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104526630 + 104526631.

It is an arithmetic number, because the mean of its divisors is an integer number (104526631).

Almost surely, 2^209053261 is an apocalyptic number.

It is an amenable number.

209053261 is a deficient number, since it is larger than the sum of its proper divisors (1).

209053261 is an equidigital number, since it uses as much as digits as its factorization.

209053261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 209053261 is about 14458.6742476619. The cubic root of 209053261 is about 593.4976205911.

The spelling of 209053261 in words is "two hundred nine million, fifty-three thousand, two hundred sixty-one".