225870817 has 2 divisors, whose sum is σ = 225870818. Its totient is φ = 225870816.

The previous prime is 225870811. The next prime is 225870847. The reversal of 225870817 is 718078522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154654096 + 71216721 = 12436^2 + 8439^2 .

It is a cyclic number.

It is not a de Polignac number, because 225870817 - 2¹⁵ = 225838049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225870817.

It is not a weakly prime, because it can be changed into another prime (225870811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112935408 + 112935409.

It is an arithmetic number, because the mean of its divisors is an integer number (112935409).

Almost surely, 2^225870817 is an apocalyptic number.

It is an amenable number.

225870817 is a deficient number, since it is larger than the sum of its proper divisors (1).

225870817 is an equidigital number, since it uses as much as digits as its factorization.

225870817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 225870817 is about 15028.9992015437. Note that the first 3 decimals coincide. The cubic root of 225870817 is about 609.0038538623.

The spelling of 225870817 in words is "two hundred twenty-five million, eight hundred seventy thousand, eight hundred seventeen".