225243837 has 72 divisors (see below), whose sum is σ = 412677720. Its totient is φ = 117331200.

The previous prime is 225243779. The next prime is 225243857. The reversal of 225243837 is 738342522.

It can be written as a sum of positive squares in 4 ways, for example, as 26687556 + 198556281 = 5166^2 + 14091^2 .

It is not a de Polignac number, because 225243837 - 2⁸ = 225243581 is a prime.

It is a super-2 number, since 2×225243837² = 101469572212965138, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225243857) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 578839 + ... + 579227.

It is an arithmetic number, because the mean of its divisors is an integer number (5731635).

Almost surely, 2^225243837 is an apocalyptic number.

It is an amenable number.

225243837 is a deficient number, since it is larger than the sum of its proper divisors (187433883).

225243837 is a wasteful number, since it uses less digits than its factorization.

225243837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 513 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 225243837 is about 15008.1256991005. The cubic root of 225243837 is about 608.4398337007.

The spelling of 225243837 in words is "two hundred twenty-five million, two hundred forty-three thousand, eight hundred thirty-seven".