225236729 has 2 divisors, whose sum is σ = 225236730. Its totient is φ = 225236728.

The previous prime is 225236717. The next prime is 225236743. The reversal of 225236729 is 927632522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203005504 + 22231225 = 14248^2 + 4715^2 .

It is a cyclic number.

It is not a de Polignac number, because 225236729 - 2¹² = 225232633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 225236692 and 225236701.

It is not a weakly prime, because it can be changed into another prime (225236789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112618364 + 112618365.

It is an arithmetic number, because the mean of its divisors is an integer number (112618365).

Almost surely, 2^225236729 is an apocalyptic number.

It is an amenable number.

225236729 is a deficient number, since it is larger than the sum of its proper divisors (1).

225236729 is an equidigital number, since it uses as much as digits as its factorization.

225236729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 225236729 is about 15007.8888921793. Note that the first 4 decimals coincide. The cubic root of 225236729 is about 608.4334334725.

The spelling of 225236729 in words is "two hundred twenty-five million, two hundred thirty-six thousand, seven hundred twenty-nine".