261255244 has 24 divisors (see below), whose sum is σ = 488452160. Its totient is φ = 121903056.

The previous prime is 261255227. The next prime is 261255251. The reversal of 261255244 is 442552162.

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 7 ways as a sum of consecutive naturals, for example, 20562 + ... + 30745.

Almost surely, 2^261255244 is an apocalyptic number.

It is an amenable number.

261255244 is a deficient number, since it is larger than the sum of its proper divisors (227196916).

261255244 is a wasteful number, since it uses less digits than its factorization.

261255244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51397 (or 51395 counting only the distinct ones).

The product of its digits is 19200, while the sum is 31.

The square root of 261255244 is about 16163.3920944831. The cubic root of 261255244 is about 639.2759095950.

The spelling of 261255244 in words is "two hundred sixty-one million, two hundred fifty-five thousand, two hundred forty-four".