261441533 has 4 divisors (see below), whose sum is σ = 261477468. Its totient is φ = 261405600.

The previous prime is 261441511. The next prime is 261441541. The reversal of 261441533 is 335144162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 174821284 + 86620249 = 13222^2 + 9307^2 .

It is a cyclic number.

It is not a de Polignac number, because 261441533 - 2⁶ = 261441469 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261441496 and 261441505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261441563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2768 + ... + 23033.

It is an arithmetic number, because the mean of its divisors is an integer number (65369367).

Almost surely, 2^261441533 is an apocalyptic number.

It is an amenable number.

261441533 is a deficient number, since it is larger than the sum of its proper divisors (35935).

261441533 is a wasteful number, since it uses less digits than its factorization.

261441533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35934.

The product of its digits is 8640, while the sum is 29.

The square root of 261441533 is about 16169.1537502740. The cubic root of 261441533 is about 639.4278194967.

Adding to 261441533 its reverse (335144162), we get a palindrome (596585695).

The spelling of 261441533 in words is "two hundred sixty-one million, four hundred forty-one thousand, five hundred thirty-three".