261225844 has 24 divisors (see below), whose sum is σ = 499127328. Its totient is φ = 118638240.

The previous prime is 261225821. The next prime is 261225847. The reversal of 261225844 is 448522162.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261225847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81007 + ... + 84169.

It is an arithmetic number, because the mean of its divisors is an integer number (20796972).

Almost surely, 2^261225844 is an apocalyptic number.

It is an amenable number.

261225844 is a deficient number, since it is larger than the sum of its proper divisors (237901484).

261225844 is a wasteful number, since it uses less digits than its factorization.

261225844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055 (or 5053 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 261225844 is about 16162.4826063325. The cubic root of 261225844 is about 639.2519286833.

The spelling of 261225844 in words is "two hundred sixty-one million, two hundred twenty-five thousand, eight hundred forty-four".