201211261 has 2 divisors, whose sum is σ = 201211262. Its totient is φ = 201211260.

The previous prime is 201211247. The next prime is 201211321. The reversal of 201211261 is 162112102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173448900 + 27762361 = 13170^2 + 5269^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211261 - 2⁵ = 201211229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605630 + 100605631.

It is an arithmetic number, because the mean of its divisors is an integer number (100605631).

Almost surely, 2^201211261 is an apocalyptic number.

It is an amenable number.

201211261 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211261 is an equidigital number, since it uses as much as digits as its factorization.

201211261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 201211261 is about 14184.8955230555. The cubic root of 201211261 is about 585.9817551892.

Adding to 201211261 its reverse (162112102), we get a palindrome (363323363).

The spelling of 201211261 in words is "two hundred one million, two hundred eleven thousand, two hundred sixty-one".