42513225 has 24 divisors (see below), whose sum is σ = 70552032. Its totient is φ = 22588800.

The previous prime is 42513221. The next prime is 42513227. The reversal of 42513225 is 52231524.

It is not a de Polignac number, because 42513225 - 2² = 42513221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42513195 and 42513204.

It is not an unprimeable number, because it can be changed into a prime (42513221) 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 23 ways as a sum of consecutive naturals, for example, 22570 + ... + 24380.

It is an arithmetic number, because the mean of its divisors is an integer number (2939668).

Almost surely, 2^42513225 is an apocalyptic number.

It is an amenable number.

42513225 is a deficient number, since it is larger than the sum of its proper divisors (28038807).

42513225 is a wasteful number, since it uses less digits than its factorization.

42513225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2132 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 42513225 is about 6520.2166375052. The cubic root of 42513225 is about 349.0127963606.

Adding to 42513225 its reverse (52231524), we get a palindrome (94744749).

The spelling of 42513225 in words is "forty-two million, five hundred thirteen thousand, two hundred twenty-five".