225542609 has 2 divisors, whose sum is σ = 225542610. Its totient is φ = 225542608.

The previous prime is 225542567. The next prime is 225542617. The reversal of 225542609 is 906245522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183331600 + 42211009 = 13540^2 + 6497^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225542609 is a prime.

It is not a weakly prime, because it can be changed into another prime (225542659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112771304 + 112771305.

It is an arithmetic number, because the mean of its divisors is an integer number (112771305).

Almost surely, 2^225542609 is an apocalyptic number.

It is an amenable number.

225542609 is a deficient number, since it is larger than the sum of its proper divisors (1).

225542609 is an equidigital number, since it uses as much as digits as its factorization.

225542609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 225542609 is about 15018.0760751835. The cubic root of 225542609 is about 608.7087340950.

The spelling of 225542609 in words is "two hundred twenty-five million, five hundred forty-two thousand, six hundred nine".