261443201 has 2 divisors, whose sum is σ = 261443202. Its totient is φ = 261443200.

The previous prime is 261443191. The next prime is 261443239. The reversal of 261443201 is 102344162.

261443201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238393600 + 23049601 = 15440^2 + 4801^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261443201 is a prime.

It is not a weakly prime, because it can be changed into another prime (261443251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130721600 + 130721601.

It is an arithmetic number, because the mean of its divisors is an integer number (130721601).

Almost surely, 2^261443201 is an apocalyptic number.

It is an amenable number.

261443201 is a deficient number, since it is larger than the sum of its proper divisors (1).

261443201 is an equidigital number, since it uses as much as digits as its factorization.

261443201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 261443201 is about 16169.2053298856. The cubic root of 261443201 is about 639.4291793461.

Adding to 261443201 its reverse (102344162), we get a palindrome (363787363).

The spelling of 261443201 in words is "two hundred sixty-one million, four hundred forty-three thousand, two hundred one".