261230365449 has 9 divisors (see below), whose sum is σ = 377334964903. Its totient is φ = 174152554752.

The previous prime is 261230365387. The next prime is 261230365507. The reversal of 261230365449 is 944563032162.

The square root of 261230365449 is 511107.

It is a perfect power (a square), and thus also a powerful number.

261230365449 is a `hidden beast` number, since 26 + 123 + 0 + 3 + 65 + 449 = 666.

It can be written as a sum of positive squares in only one way, i.e., 257411125449 + 3819240000 = 507357^2 + 61800^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 261230365449 - 2⁷ = 261230365321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261230364449) 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 in 8 ways as a sum of consecutive naturals, for example, 1448137 + ... + 1618505.

Almost surely, 2^261230365449 is an apocalyptic number.

261230365449 is the 511107-th square number.

261230365449 is the 255554-th centered octagonal number.

It is an amenable number.

261230365449 is a deficient number, since it is larger than the sum of its proper divisors (116104599454).

261230365449 is an frugal number, since it uses more digits than its factorization.

261230365449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340744 (or 170372 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 261230365449 in words is "two hundred sixty-one billion, two hundred thirty million, three hundred sixty-five thousand, four hundred forty-nine".