261532533 has 4 divisors (see below), whose sum is σ = 348710048. Its totient is φ = 174355020.

The previous prime is 261532507. The next prime is 261532571. The reversal of 261532533 is 335235162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261532533 - 2²⁰ = 260483957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261532533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261532133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43588753 + ... + 43588758.

It is an arithmetic number, because the mean of its divisors is an integer number (87177512).

Almost surely, 2^261532533 is an apocalyptic number.

It is an amenable number.

261532533 is a deficient number, since it is larger than the sum of its proper divisors (87177515).

261532533 is an equidigital number, since it uses as much as digits as its factorization.

261532533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87177514.

The product of its digits is 16200, while the sum is 30.

The square root of 261532533 is about 16171.9675055325. The cubic root of 261532533 is about 639.5019994750.

Adding to 261532533 its reverse (335235162), we get a palindrome (596767695).

The spelling of 261532533 in words is "two hundred sixty-one million, five hundred thirty-two thousand, five hundred thirty-three".