261131804 has 12 divisors (see below), whose sum is σ = 463241184. Its totient is φ = 128777184.

The previous prime is 261131803. The next prime is 261131809. The reversal of 261131804 is 408131162.

261131804 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261131803) 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 3 ways as a sum of consecutive naturals, for example, 446852 + ... + 447435.

It is an arithmetic number, because the mean of its divisors is an integer number (38603432).

Almost surely, 2^261131804 is an apocalyptic number.

It is an amenable number.

261131804 is a deficient number, since it is larger than the sum of its proper divisors (202109380).

261131804 is a wasteful number, since it uses less digits than its factorization.

261131804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894364 (or 894362 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 261131804 is about 16159.5731379266. The cubic root of 261131804 is about 639.1752103086.

Adding to 261131804 its reverse (408131162), we get a palindrome (669262966).

The spelling of 261131804 in words is "two hundred sixty-one million, one hundred thirty-one thousand, eight hundred four".