225681551 has 2 divisors, whose sum is σ = 225681552. Its totient is φ = 225681550.

The previous prime is 225681541. The next prime is 225681553. The reversal of 225681551 is 155186522.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225681551 is a prime.

Together with 225681553, 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 (225681553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112840775 + 112840776.

It is an arithmetic number, because the mean of its divisors is an integer number (112840776).

Almost surely, 2^225681551 is an apocalyptic number.

225681551 is a deficient number, since it is larger than the sum of its proper divisors (1).

225681551 is an equidigital number, since it uses as much as digits as its factorization.

225681551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 35.

The square root of 225681551 is about 15022.7011885346. The cubic root of 225681551 is about 608.8337036047.

The spelling of 225681551 in words is "two hundred twenty-five million, six hundred eighty-one thousand, five hundred fifty-one".