261224 has 8 divisors (see below), whose sum is σ = 489810. Its totient is φ = 130608.

The previous prime is 261223. The next prime is 261229. The reversal of 261224 is 422162.

It can be written as a sum of positive squares in only one way, i.e., 232324 + 28900 = 482^2 + 170^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (261223) 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 as a sum of consecutive naturals, namely, 16319 + ... + 16334.

2²⁶¹²²⁴ is an apocalyptic number.

It is an amenable number.

261224 is a deficient number, since it is larger than the sum of its proper divisors (228586).

261224 is a wasteful number, since it uses less digits than its factorization.

261224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32659 (or 32655 counting only the distinct ones).

The product of its digits is 192, while the sum is 17.

The square root of 261224 is about 511.1007728423. The cubic root of 261224 is about 63.9250424514.

Adding to 261224 its reverse (422162), we get a palindrome (683386).

The spelling of 261224 in words is "two hundred sixty-one thousand, two hundred twenty-four".