261241 has 2 divisors, whose sum is σ = 261242. Its totient is φ = 261240.

The previous prime is 261229. The next prime is 261251. The reversal of 261241 is 142162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254016 + 7225 = 504^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 261241 - 2¹³ = 253049 is a prime.

It is not a weakly prime, because it can be changed into another prime (261251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130620 + 130621.

It is an arithmetic number, because the mean of its divisors is an integer number (130621).

2²⁶¹²⁴¹ is an apocalyptic number.

It is an amenable number.

261241 is a deficient number, since it is larger than the sum of its proper divisors (1).

261241 is an equidigital number, since it uses as much as digits as its factorization.

261241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 16.

The square root of 261241 is about 511.1174033429. The cubic root of 261241 is about 63.9264291313.

The spelling of 261241 in words is "two hundred sixty-one thousand, two hundred forty-one".