261225126 has 12 divisors (see below), whose sum is σ = 565987812. Its totient is φ = 87075036.

The previous prime is 261225121. The next prime is 261225137. The reversal of 261225126 is 621522162.

261225126 is a `hidden beast` number, since 2 + 612 + 25 + 1 + 26 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 261225126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261225121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7256236 + ... + 7256271.

It is an arithmetic number, because the mean of its divisors is an integer number (47165651).

Almost surely, 2^261225126 is an apocalyptic number.

261225126 is an abundant number, since it is smaller than the sum of its proper divisors (304762686).

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

261225126 is a wasteful number, since it uses less digits than its factorization.

261225126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14512515 (or 14512512 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 261225126 is about 16162.4603943830. The cubic root of 261225126 is about 639.2513430046.

Adding to 261225126 its reverse (621522162), we get a palindrome (882747288).

The spelling of 261225126 in words is "two hundred sixty-one million, two hundred twenty-five thousand, one hundred twenty-six".