261611204 has 12 divisors (see below), whose sum is σ = 473606700. Its totient is φ = 126295008.

The previous prime is 261611191. The next prime is 261611243. The reversal of 261611204 is 402116162.

It can be written as a sum of positive squares in 2 ways, for example, as 196840900 + 64770304 = 14030^2 + 8048^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261611204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1127519 + ... + 1127750.

It is an arithmetic number, because the mean of its divisors is an integer number (39467225).

Almost surely, 2^261611204 is an apocalyptic number.

It is an amenable number.

261611204 is a deficient number, since it is larger than the sum of its proper divisors (211995496).

261611204 is a wasteful number, since it uses less digits than its factorization.

261611204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255302 (or 2255300 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 261611204 is about 16174.3996488278. The cubic root of 261611204 is about 639.5661154220.

Adding to 261611204 its reverse (402116162), we get a palindrome (663727366).

The spelling of 261611204 in words is "two hundred sixty-one million, six hundred eleven thousand, two hundred four".