261401201 has 2 divisors, whose sum is σ = 261401202. Its totient is φ = 261401200.

The previous prime is 261401191. The next prime is 261401243. The reversal of 261401201 is 102104162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156850576 + 104550625 = 12524^2 + 10225^2 .

It is a cyclic number.

It is not a de Polignac number, because 261401201 - 2⁶ = 261401137 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261401201.

It is not a weakly prime, because it can be changed into another prime (261400201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130700600 + 130700601.

It is an arithmetic number, because the mean of its divisors is an integer number (130700601).

Almost surely, 2^261401201 is an apocalyptic number.

It is an amenable number.

261401201 is a deficient number, since it is larger than the sum of its proper divisors (1).

261401201 is an equidigital number, since it uses as much as digits as its factorization.

261401201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 261401201 is about 16167.9065125946. The cubic root of 261401201 is about 639.3949367730.

Adding to 261401201 its reverse (102104162), we get a palindrome (363505363).

The spelling of 261401201 in words is "two hundred sixty-one million, four hundred one thousand, two hundred one".