42145525 has 6 divisors (see below), whose sum is σ = 52260482. Its totient is φ = 33716400.

The previous prime is 42145513. The next prime is 42145541. The reversal of 42145525 is 52554124.

42145525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 9678321 + 32467204 = 3111^2 + 5698^2 .

It is a de Polignac number, because none of the positive numbers 2^k-42145525 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42145493 and 42145502.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 842886 + ... + 842935.

Almost surely, 2^42145525 is an apocalyptic number.

It is an amenable number.

42145525 is a deficient number, since it is larger than the sum of its proper divisors (10114957).

42145525 is a wasteful number, since it uses less digits than its factorization.

42145525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685831 (or 1685826 counting only the distinct ones).

The product of its digits is 8000, while the sum is 28.

The square root of 42145525 is about 6491.9584872363. The cubic root of 42145525 is about 348.0036689841.

Adding to 42145525 its reverse (52554124), we get a palindrome (94699649).

The spelling of 42145525 in words is "forty-two million, one hundred forty-five thousand, five hundred twenty-five".