42625521 has 20 divisors (see below), whose sum is σ = 64252452. Its totient is φ = 28159488.

The previous prime is 42625487. The next prime is 42625523. The reversal of 42625521 is 12552624.

42625521 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 2 ways, for example, as 2480625 + 40144896 = 1575^2 + 6336^2 .

It is not a de Polignac number, because 42625521 - 2¹¹ = 42623473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (42625523) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 6825 + ... + 11481.

Almost surely, 2^42625521 is an apocalyptic number.

It is an amenable number.

42625521 is a deficient number, since it is larger than the sum of its proper divisors (21626931).

42625521 is a wasteful number, since it uses less digits than its factorization.

42625521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782 (or 4773 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 42625521 is about 6528.8223287205. The cubic root of 42625521 is about 349.3198246100.

The spelling of 42625521 in words is "forty-two million, six hundred twenty-five thousand, five hundred twenty-one".