261334506 has 32 divisors (see below), whose sum is σ = 554273280. Its totient is φ = 81860096.

The previous prime is 261334501. The next prime is 261334517. The reversal of 261334506 is 605433162.

261334506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261334501) 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 15 ways as a sum of consecutive naturals, for example, 80935 + ... + 84101.

It is an arithmetic number, because the mean of its divisors is an integer number (17321040).

Almost surely, 2^261334506 is an apocalyptic number.

261334506 is an abundant number, since it is smaller than the sum of its proper divisors (292938774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261334506 is a wasteful number, since it uses less digits than its factorization.

261334506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3998.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 261334506 is about 16165.8438072375. The cubic root of 261334506 is about 639.3405528445.

Adding to 261334506 its reverse (605433162), we get a palindrome (866767668).

The spelling of 261334506 in words is "two hundred sixty-one million, three hundred thirty-four thousand, five hundred six".