261353 has 2 divisors, whose sum is σ = 261354. Its totient is φ = 261352.

The previous prime is 261347. The next prime is 261379. The reversal of 261353 is 353162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218089 + 43264 = 467^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 261353 - 2⁴ = 261337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (261323) 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, 130676 + 130677.

It is an arithmetic number, because the mean of its divisors is an integer number (130677).

2²⁶¹³⁵³ is an apocalyptic number.

It is an amenable number.

261353 is a deficient number, since it is larger than the sum of its proper divisors (1).

261353 is an equidigital number, since it uses as much as digits as its factorization.

261353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 20.

The square root of 261353 is about 511.2269554709. The cubic root of 261353 is about 63.9355634008.

Subtracting 261353 from its reverse (353162), we obtain a square (91809 = 303²).

The spelling of 261353 in words is "two hundred sixty-one thousand, three hundred fifty-three".