261233285 has 16 divisors (see below), whose sum is σ = 322707456. Its totient is φ = 202906368.

The previous prime is 261233267. The next prime is 261233317. The reversal of 261233285 is 582332162.

It is a cyclic number.

It is not a de Polignac number, because 261233285 - 2¹⁸ = 260971141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 25469 + ... + 34221.

It is an arithmetic number, because the mean of its divisors is an integer number (20169216).

Almost surely, 2^261233285 is an apocalyptic number.

It is an amenable number.

261233285 is a deficient number, since it is larger than the sum of its proper divisors (61474171).

261233285 is a wasteful number, since it uses less digits than its factorization.

261233285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8932.

The product of its digits is 17280, while the sum is 32.

The square root of 261233285 is about 16162.7127982898. The cubic root of 261233285 is about 639.2579983080.

The spelling of 261233285 in words is "two hundred sixty-one million, two hundred thirty-three thousand, two hundred eighty-five".