225784421 has 2 divisors, whose sum is σ = 225784422. Its totient is φ = 225784420.

The previous prime is 225784379. The next prime is 225784423. The reversal of 225784421 is 124487522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115240225 + 110544196 = 10735^2 + 10514^2 .

It is a cyclic number.

It is not a de Polignac number, because 225784421 - 2¹⁸ = 225522277 is a prime.

Together with 225784423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225784423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112892210 + 112892211.

It is an arithmetic number, because the mean of its divisors is an integer number (112892211).

Almost surely, 2^225784421 is an apocalyptic number.

It is an amenable number.

225784421 is a deficient number, since it is larger than the sum of its proper divisors (1).

225784421 is an equidigital number, since it uses as much as digits as its factorization.

225784421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 35.

The square root of 225784421 is about 15026.1246168132. The cubic root of 225784421 is about 608.9261955978.

The spelling of 225784421 in words is "two hundred twenty-five million, seven hundred eighty-four thousand, four hundred twenty-one".