225242309 has 2 divisors, whose sum is σ = 225242310. Its totient is φ = 225242308.

The previous prime is 225242279. The next prime is 225242341. The reversal of 225242309 is 903242522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218596225 + 6646084 = 14785^2 + 2578^2 .

It is a cyclic number.

It is not a de Polignac number, because 225242309 - 2⁸ = 225242053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225242399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112621154 + 112621155.

It is an arithmetic number, because the mean of its divisors is an integer number (112621155).

Almost surely, 2^225242309 is an apocalyptic number.

It is an amenable number.

225242309 is a deficient number, since it is larger than the sum of its proper divisors (1).

225242309 is an equidigital number, since it uses as much as digits as its factorization.

225242309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 225242309 is about 15008.0747932571. The cubic root of 225242309 is about 608.4384578611.

The spelling of 225242309 in words is "two hundred twenty-five million, two hundred forty-two thousand, three hundred nine".