261443313 has 12 divisors (see below), whose sum is σ = 383277648. Its totient is φ = 171693720.

The previous prime is 261443291. The next prime is 261443317. The reversal of 261443313 is 313344162.

261443313 is a `hidden beast` number, since 2 + 614 + 4 + 33 + 13 = 666.

It is not a de Polignac number, because 261443313 - 2¹⁰ = 261442289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261443317) 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 11 ways as a sum of consecutive naturals, for example, 216183 + ... + 217388.

It is an arithmetic number, because the mean of its divisors is an integer number (31939804).

Almost surely, 2^261443313 is an apocalyptic number.

It is an amenable number.

261443313 is a deficient number, since it is larger than the sum of its proper divisors (121834335).

261443313 is a wasteful number, since it uses less digits than its factorization.

261443313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433644 (or 433641 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 261443313 is about 16169.2087932589. The cubic root of 261443313 is about 639.4292706547.

Adding to 261443313 its reverse (313344162), we get a palindrome (574787475).

The spelling of 261443313 in words is "two hundred sixty-one million, four hundred forty-three thousand, three hundred thirteen".