225971861 has 2 divisors, whose sum is σ = 225971862. Its totient is φ = 225971860.

The previous prime is 225971833. The next prime is 225971881. The reversal of 225971861 is 168179522.

225971861 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., 222188836 + 3783025 = 14906^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 225971861 - 2¹⁸ = 225709717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225971881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112985930 + 112985931.

It is an arithmetic number, because the mean of its divisors is an integer number (112985931).

Almost surely, 2^225971861 is an apocalyptic number.

It is an amenable number.

225971861 is a deficient number, since it is larger than the sum of its proper divisors (1).

225971861 is an equidigital number, since it uses as much as digits as its factorization.

225971861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 225971861 is about 15032.3604600209. The cubic root of 225971861 is about 609.0946535686.

The spelling of 225971861 in words is "two hundred twenty-five million, nine hundred seventy-one thousand, eight hundred sixty-one".