225556405 has 8 divisors (see below), whose sum is σ = 272392632. Its totient is φ = 179295168.

The previous prime is 225556399. The next prime is 225556433. The reversal of 225556405 is 504655522.

It can be written as a sum of positive squares in 4 ways, for example, as 38167684 + 187388721 = 6178^2 + 13689^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 225556405 - 2¹⁵ = 225523637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142882 + ... + 144451.

It is an arithmetic number, because the mean of its divisors is an integer number (34049079).

Almost surely, 2^225556405 is an apocalyptic number.

It is an amenable number.

225556405 is a deficient number, since it is larger than the sum of its proper divisors (46836227).

225556405 is a wasteful number, since it uses less digits than its factorization.

225556405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287495.

The product of its (nonzero) digits is 60000, while the sum is 34.

The square root of 225556405 is about 15018.5353813213. The cubic root of 225556405 is about 608.7211450159.

It can be divided in two parts, 2255 and 56405, that multiplied together give a triangular number (127193275 = T₁₅₉₄₉).

The spelling of 225556405 in words is "two hundred twenty-five million, five hundred fifty-six thousand, four hundred five".