225912941809 has 27 divisors (see below), whose sum is σ = 243953073633. Its totient is φ = 209163739392.

The previous prime is 225912941797. The next prime is 225912941831. The reversal of 225912941809 is 908149219522.

It is a happy number.

The square root of 225912941809 is 475303.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 28528223409 + 197384718400 = 168903^2 + 444280^2 .

It is not a de Polignac number, because 225912941809 - 2³³ = 217323007217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225912941879) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 589850832 + ... + 589851214.

Almost surely, 2^225912941809 is an apocalyptic number.

225912941809 is the 475303-rd square number.

225912941809 is the 237652-nd centered octagonal number.

It is an amenable number.

225912941809 is a deficient number, since it is larger than the sum of its proper divisors (18040131824).

225912941809 is an frugal number, since it uses more digits than its factorization.

225912941809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 225912941809 in words is "two hundred twenty-five billion, nine hundred twelve million, nine hundred forty-one thousand, eight hundred nine".