225224981 has 2 divisors, whose sum is σ = 225224982. Its totient is φ = 225224980.

The previous prime is 225224977. The next prime is 225224983. The reversal of 225224981 is 189422522.

It is a happy number.

225224981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220671025 + 4553956 = 14855^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 225224981 - 2² = 225224977 is a prime.

It is a super-2 number, since 2×225224981² = 101452584132900722, which contains 22 as substring.

Together with 225224983, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12394529 and since 225224981 and 12394529 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225224983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112612490 + 112612491.

It is an arithmetic number, because the mean of its divisors is an integer number (112612491).

Almost surely, 2^225224981 is an apocalyptic number.

It is an amenable number.

225224981 is a deficient number, since it is larger than the sum of its proper divisors (1).

225224981 is an equidigital number, since it uses as much as digits as its factorization.

225224981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 35.

The square root of 225224981 is about 15007.4974929200. The cubic root of 225224981 is about 608.4228549725.

The spelling of 225224981 in words is "two hundred twenty-five million, two hundred twenty-four thousand, nine hundred eighty-one".