261004134 has 8 divisors (see below), whose sum is σ = 522008280. Its totient is φ = 87001376.

The previous prime is 261004103. The next prime is 261004151. The reversal of 261004134 is 431400162.

It is a sphenic number, since it is the product of 3 distinct primes.

261004134 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 261004134.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 21750339 + ... + 21750350.

It is an arithmetic number, because the mean of its divisors is an integer number (65251035).

Almost surely, 2^261004134 is an apocalyptic number.

261004134 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261004134 is a wasteful number, since it uses less digits than its factorization.

261004134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43500694.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 261004134 is about 16155.6223649849. The cubic root of 261004134 is about 639.0710269034.

Adding to 261004134 its reverse (431400162), we get a palindrome (692404296).

The spelling of 261004134 in words is "two hundred sixty-one million, four thousand, one hundred thirty-four".