225666431 has 4 divisors (see below), whose sum is σ = 226058112. Its totient is φ = 225274752.

The previous prime is 225666407. The next prime is 225666437. The reversal of 225666431 is 134666522.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 225666431 - 2¹⁸ = 225404287 is a prime.

It is a super-2 number, since 2×225666431² = 101850676160555522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225666391 and 225666400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225666437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194975 + ... + 196128.

It is an arithmetic number, because the mean of its divisors is an integer number (56514528).

Almost surely, 2^225666431 is an apocalyptic number.

225666431 is a deficient number, since it is larger than the sum of its proper divisors (391681).

225666431 is an equidigital number, since it uses as much as digits as its factorization.

225666431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391680.

The product of its digits is 51840, while the sum is 35.

The square root of 225666431 is about 15022.1979417128. The cubic root of 225666431 is about 608.8201066120.

Subtracting from 225666431 its reverse (134666522), we obtain a palindrome (90999909).

The spelling of 225666431 in words is "two hundred twenty-five million, six hundred sixty-six thousand, four hundred thirty-one".