261284 has 12 divisors (see below), whose sum is σ = 463344. Its totient is φ = 128904.

The previous prime is 261281. The next prime is 261301. The reversal of 261284 is 482162.

It is not an unprimeable number, because it can be changed into a prime (261281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62 + ... + 725.

It is an arithmetic number, because the mean of its divisors is an integer number (38612).

2²⁶¹²⁸⁴ is an apocalyptic number.

It is an amenable number.

261284 is a deficient number, since it is larger than the sum of its proper divisors (202060).

261284 is a wasteful number, since it uses less digits than its factorization.

261284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 872 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 261284 is about 511.1594663116. The cubic root of 261284 is about 63.9299363470.

It can be divided in two parts, 261 and 284, that added together give a palindrome (545).

The spelling of 261284 in words is "two hundred sixty-one thousand, two hundred eighty-four".