42553521 has 12 divisors (see below), whose sum is σ = 64701520. Its totient is φ = 26875800.

The previous prime is 42553517. The next prime is 42553543. The reversal of 42553521 is 12535524.

It is a happy number.

It is not a de Polignac number, because 42553521 - 2² = 42553517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42553561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124255 + ... + 124596.

Almost surely, 2^42553521 is an apocalyptic number.

It is an amenable number.

42553521 is a deficient number, since it is larger than the sum of its proper divisors (22147999).

42553521 is a wasteful number, since it uses less digits than its factorization.

42553521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248876 (or 248873 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 42553521 is about 6523.3059869977. The cubic root of 42553521 is about 349.1230316935.

It can be divided in two parts, 4255 and 3521, that added together give a 5-th power (7776 = 6⁵).

The spelling of 42553521 in words is "forty-two million, five hundred fifty-three thousand, five hundred twenty-one".