225420551 has 2 divisors, whose sum is σ = 225420552. Its totient is φ = 225420550.

The previous prime is 225420521. The next prime is 225420553. The reversal of 225420551 is 155024522.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225420551 is a prime.

Together with 225420553, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225420551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225420553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112710275 + 112710276.

It is an arithmetic number, because the mean of its divisors is an integer number (112710276).

Almost surely, 2^225420551 is an apocalyptic number.

225420551 is a deficient number, since it is larger than the sum of its proper divisors (1).

225420551 is an equidigital number, since it uses as much as digits as its factorization.

225420551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 225420551 is about 15014.0118222945. The cubic root of 225420551 is about 608.5989083172.

The spelling of 225420551 in words is "two hundred twenty-five million, four hundred twenty thousand, five hundred fifty-one".