225759781 has 4 divisors (see below), whose sum is σ = 243125932. Its totient is φ = 208393632.

The previous prime is 225759773. The next prime is 225759797. The reversal of 225759781 is 187957522.

It is a happy number.

225759781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49773025 + 175986756 = 7055^2 + 13266^2 .

It is a cyclic number.

It is not a de Polignac number, because 225759781 - 2³ = 225759773 is a prime.

It is a super-2 number, since 2×225759781² = 101934957434335922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225759181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8683056 + ... + 8683081.

It is an arithmetic number, because the mean of its divisors is an integer number (60781483).

Almost surely, 2^225759781 is an apocalyptic number.

It is an amenable number.

225759781 is a deficient number, since it is larger than the sum of its proper divisors (17366151).

225759781 is a wasteful number, since it uses less digits than its factorization.

225759781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17366150.

The product of its digits is 352800, while the sum is 46.

The square root of 225759781 is about 15025.3046890903. The cubic root of 225759781 is about 608.9040439554.

The spelling of 225759781 in words is "two hundred twenty-five million, seven hundred fifty-nine thousand, seven hundred eighty-one".