225555261 has 8 divisors (see below), whose sum is σ = 300821664. Its totient is φ = 150329520.

The previous prime is 225555241. The next prime is 225555263. The reversal of 225555261 is 162555522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 225555261 - 2⁵ = 225555229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225555263) 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 7 ways as a sum of consecutive naturals, for example, 6850 + ... + 22316.

It is an arithmetic number, because the mean of its divisors is an integer number (37602708).

Almost surely, 2^225555261 is an apocalyptic number.

It is an amenable number.

225555261 is a deficient number, since it is larger than the sum of its proper divisors (75266403).

225555261 is a wasteful number, since it uses less digits than its factorization.

225555261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20331.

The product of its digits is 30000, while the sum is 33.

The square root of 225555261 is about 15018.4972950026. The cubic root of 225555261 is about 608.7201158895.

The spelling of 225555261 in words is "two hundred twenty-five million, five hundred fifty-five thousand, two hundred sixty-one".