261233210 has 24 divisors (see below), whose sum is σ = 546991380. Its totient is φ = 89565504.

The previous prime is 261233173. The next prime is 261233227. The reversal of 261233210 is 12332162.

It is a happy number.

261233210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 257634601 + 3598609 = 16051^2 + 1897^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 266075 + ... + 267054.

Almost surely, 2^261233210 is an apocalyptic number.

261233210 is an abundant number, since it is smaller than the sum of its proper divisors (285758170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261233210 is a wasteful number, since it uses less digits than its factorization.

261233210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533150 (or 533143 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 261233210 is about 16162.7104781345. The cubic root of 261233210 is about 639.2579371310.

Adding to 261233210 its reverse (12332162), we get a palindrome (273565372).

The spelling of 261233210 in words is "two hundred sixty-one million, two hundred thirty-three thousand, two hundred ten".