42518225 has 6 divisors (see below), whose sum is σ = 52722630. Its totient is φ = 34014560.

The previous prime is 42518213. The next prime is 42518227. The reversal of 42518225 is 52281524.

It can be written as a sum of positive squares in 3 ways, for example, as 5271616 + 37246609 = 2296^2 + 6103^2 .

It is not a de Polignac number, because 42518225 - 2⁴ = 42518209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42518227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 850340 + ... + 850389.

It is an arithmetic number, because the mean of its divisors is an integer number (8787105).

Almost surely, 2^42518225 is an apocalyptic number.

It is an amenable number.

42518225 is a deficient number, since it is larger than the sum of its proper divisors (10204405).

42518225 is a wasteful number, since it uses less digits than its factorization.

42518225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700739 (or 1700734 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

The square root of 42518225 is about 6520.6000490752. The cubic root of 42518225 is about 349.0264783429.

Adding to 42518225 its reverse (52281524), we get a palindrome (94799749).

The spelling of 42518225 in words is "forty-two million, five hundred eighteen thousand, two hundred twenty-five".