201226261 has 2 divisors, whose sum is σ = 201226262. Its totient is φ = 201226260.

The previous prime is 201226243. The next prime is 201226307. The reversal of 201226261 is 162622102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158911236 + 42315025 = 12606^2 + 6505^2 .

It is a cyclic number.

It is not a de Polignac number, because 201226261 - 2⁷ = 201226133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201226231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100613130 + 100613131.

It is an arithmetic number, because the mean of its divisors is an integer number (100613131).

Almost surely, 2^201226261 is an apocalyptic number.

It is an amenable number.

201226261 is a deficient number, since it is larger than the sum of its proper divisors (1).

201226261 is an equidigital number, since it uses as much as digits as its factorization.

201226261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 201226261 is about 14185.4242446252. The cubic root of 201226261 is about 585.9963161832.

Adding to 201226261 its reverse (162622102), we get a palindrome (363848363).

The spelling of 201226261 in words is "two hundred one million, two hundred twenty-six thousand, two hundred sixty-one".