225647509 has 2 divisors, whose sum is σ = 225647510. Its totient is φ = 225647508.

The previous prime is 225647501. The next prime is 225647519. The reversal of 225647509 is 905746522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216737284 + 8910225 = 14722^2 + 2985^2 .

It is a cyclic number.

It is not a de Polignac number, because 225647509 - 2³ = 225647501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225647501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112823754 + 112823755.

It is an arithmetic number, because the mean of its divisors is an integer number (112823755).

Almost surely, 2^225647509 is an apocalyptic number.

It is an amenable number.

225647509 is a deficient number, since it is larger than the sum of its proper divisors (1).

225647509 is an equidigital number, since it uses as much as digits as its factorization.

225647509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 225647509 is about 15021.5681271963. The cubic root of 225647509 is about 608.8030897315.

The spelling of 225647509 in words is "two hundred twenty-five million, six hundred forty-seven thousand, five hundred nine".