225187785 has 24 divisors (see below), whose sum is σ = 399848904. Its totient is φ = 117169920.

The previous prime is 225187771. The next prime is 225187793. The reversal of 225187785 is 587781522.

It can be written as a sum of positive squares in 4 ways, for example, as 12873744 + 212314041 = 3588^2 + 14571^2 .

It is not a de Polignac number, because 225187785 - 2⁷ = 225187657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 225187785.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59182 + ... + 62871.

It is an arithmetic number, because the mean of its divisors is an integer number (16660371).

Almost surely, 2^225187785 is an apocalyptic number.

It is an amenable number.

225187785 is a deficient number, since it is larger than the sum of its proper divisors (174661119).

225187785 is a wasteful number, since it uses less digits than its factorization.

225187785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122105 (or 122102 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 225187785 is about 15006.2581945001. The cubic root of 225187785 is about 608.3893593653.

It can be divided in two parts, 22518 and 7785, that added together give a palindrome (30303).

The spelling of 225187785 in words is "two hundred twenty-five million, one hundred eighty-seven thousand, seven hundred eighty-five".