225970981 has 2 divisors, whose sum is σ = 225970982. Its totient is φ = 225970980.

The previous prime is 225970963. The next prime is 225971027. The reversal of 225970981 is 189079522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149670756 + 76300225 = 12234^2 + 8735^2 .

It is a cyclic number.

It is not a de Polignac number, because 225970981 - 2¹⁵ = 225938213 is a prime.

It is a super-2 number, since 2×225970981² = 102125768508204722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225970931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112985490 + 112985491.

It is an arithmetic number, because the mean of its divisors is an integer number (112985491).

Almost surely, 2^225970981 is an apocalyptic number.

It is an amenable number.

225970981 is a deficient number, since it is larger than the sum of its proper divisors (1).

225970981 is an equidigital number, since it uses as much as digits as its factorization.

225970981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 225970981 is about 15032.3311898055. The cubic root of 225970981 is about 609.0938629038.

The spelling of 225970981 in words is "two hundred twenty-five million, nine hundred seventy thousand, nine hundred eighty-one".