225243813 has 16 divisors (see below), whose sum is σ = 303811200. Its totient is φ = 148426560.

The previous prime is 225243779. The next prime is 225243857. The reversal of 225243813 is 318342522.

It is not a de Polignac number, because 225243813 - 2¹⁰ = 225242789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225243413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268048 + ... + 268886.

It is an arithmetic number, because the mean of its divisors is an integer number (18988200).

Almost surely, 2^225243813 is an apocalyptic number.

It is an amenable number.

225243813 is a deficient number, since it is larger than the sum of its proper divisors (78567387).

225243813 is a wasteful number, since it uses less digits than its factorization.

225243813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772.

The product of its digits is 11520, while the sum is 30.

The square root of 225243813 is about 15008.1248995336. The cubic root of 225243813 is about 608.4398120907.

The spelling of 225243813 in words is "two hundred twenty-five million, two hundred forty-three thousand, eight hundred thirteen".