261333 has 8 divisors (see below), whose sum is σ = 387200. Its totient is φ = 174204.

The previous prime is 261329. The next prime is 261337. The reversal of 261333 is 333162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261329) and next prime (261337).

It is not a de Polignac number, because 261333 - 2² = 261329 is a prime.

It is a Duffinian number.

261333 is a modest number, since divided by 333 gives 261 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4813 + ... + 4866.

It is an arithmetic number, because the mean of its divisors is an integer number (48400).

2²⁶¹³³³ is an apocalyptic number.

It is an amenable number.

261333 is a deficient number, since it is larger than the sum of its proper divisors (125867).

261333 is an equidigital number, since it uses as much as digits as its factorization.

261333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9688 (or 9682 counting only the distinct ones).

The product of its digits is 324, while the sum is 18.

The square root of 261333 is about 511.2073943127. The cubic root of 261333 is about 63.9339324727.

Adding to 261333 its reverse (333162), we get a palindrome (594495).

The spelling of 261333 in words is "two hundred sixty-one thousand, three hundred thirty-three".