261204525 has 36 divisors (see below), whose sum is σ = 474856512. Its totient is φ = 137221920.

The previous prime is 261204523. The next prime is 261204529. The reversal of 261204525 is 525402162.

261204525 is a `hidden beast` number, since 2 + 612 + 0 + 45 + 2 + 5 = 666.

It is not a de Polignac number, because 261204525 - 2¹ = 261204523 is a prime.

It is a super-3 number, since 3×261204525³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261204523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6412 + ... + 23738.

Almost surely, 2^261204525 is an apocalyptic number.

261204525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261204525 is a deficient number, since it is larger than the sum of its proper divisors (213651987).

261204525 is a wasteful number, since it uses less digits than its factorization.

261204525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17410 (or 17402 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 261204525 is about 16161.8230716711. The cubic root of 261204525 is about 639.2345381342.

Adding to 261204525 its reverse (525402162), we get a palindrome (786606687).

The spelling of 261204525 in words is "two hundred sixty-one million, two hundred four thousand, five hundred twenty-five".