225617881 has 2 divisors, whose sum is σ = 225617882. Its totient is φ = 225617880.

The previous prime is 225617851. The next prime is 225617891. The reversal of 225617881 is 188716522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225150025 + 467856 = 15005^2 + 684^2 .

It is a cyclic number.

It is not a de Polignac number, because 225617881 - 2⁵ = 225617849 is a prime.

It is a super-2 number, since 2×225617881² = 101806856453860322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (225617801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112808940 + 112808941.

It is an arithmetic number, because the mean of its divisors is an integer number (112808941).

Almost surely, 2^225617881 is an apocalyptic number.

It is an amenable number.

225617881 is a deficient number, since it is larger than the sum of its proper divisors (1).

225617881 is an equidigital number, since it uses as much as digits as its factorization.

225617881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 40.

The square root of 225617881 is about 15020.5819128288. The cubic root of 225617881 is about 608.7764428498.

The spelling of 225617881 in words is "two hundred twenty-five million, six hundred seventeen thousand, eight hundred eighty-one".