261323441 has 2 divisors, whose sum is σ = 261323442. Its totient is φ = 261323440.

The previous prime is 261323423. The next prime is 261323453. The reversal of 261323441 is 144323162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176757025 + 84566416 = 13295^2 + 9196^2 .

It is a cyclic number.

It is not a de Polignac number, because 261323441 - 2¹⁰ = 261322417 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261323441.

It is not a weakly prime, because it can be changed into another prime (261323471) 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, 130661720 + 130661721.

It is an arithmetic number, because the mean of its divisors is an integer number (130661721).

Almost surely, 2^261323441 is an apocalyptic number.

It is an amenable number.

261323441 is a deficient number, since it is larger than the sum of its proper divisors (1).

261323441 is an equidigital number, since it uses as much as digits as its factorization.

261323441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 261323441 is about 16165.5015697008. The cubic root of 261323441 is about 639.3315294117.

The spelling of 261323441 in words is "two hundred sixty-one million, three hundred twenty-three thousand, four hundred forty-one".