225697509 has 10 divisors (see below), whose sum is σ = 337153190. Its totient is φ = 150464952.

The previous prime is 225697441. The next prime is 225697513. The reversal of 225697509 is 905796522.

225697509 is a `hidden beast` number, since 2 + 2 + 56 + 97 + 509 = 666.

It can be written as a sum of positive squares in only one way, i.e., 199656900 + 26040609 = 14130^2 + 5103^2 .

It is not a de Polignac number, because 225697509 - 2²¹ = 223600357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225697519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1393114 + ... + 1393275.

It is an arithmetic number, because the mean of its divisors is an integer number (33715319).

Almost surely, 2^225697509 is an apocalyptic number.

It is an amenable number.

225697509 is a deficient number, since it is larger than the sum of its proper divisors (111455681).

225697509 is an equidigital number, since it uses as much as digits as its factorization.

225697509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786401 (or 2786392 counting only the distinct ones).

The product of its (nonzero) digits is 340200, while the sum is 45.

The square root of 225697509 is about 15023.2323086611. The cubic root of 225697509 is about 608.8480535286.

The spelling of 225697509 in words is "two hundred twenty-five million, six hundred ninety-seven thousand, five hundred nine".