42649521 has 32 divisors (see below), whose sum is σ = 62128128. Its totient is φ = 25945920.

The previous prime is 42649513. The next prime is 42649531. The reversal of 42649521 is 12594624.

42649521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42649521 - 2³ = 42649513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42649501) 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 31 ways as a sum of consecutive naturals, for example, 271575 + ... + 271731.

It is an arithmetic number, because the mean of its divisors is an integer number (1941504).

Almost surely, 2^42649521 is an apocalyptic number.

It is an amenable number.

42649521 is a deficient number, since it is larger than the sum of its proper divisors (19478607).

42649521 is a wasteful number, since it uses less digits than its factorization.

42649521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341.

The product of its digits is 17280, while the sum is 33.

The square root of 42649521 is about 6530.6600738363. The cubic root of 42649521 is about 349.3853730001.

The spelling of 42649521 in words is "forty-two million, six hundred forty-nine thousand, five hundred twenty-one".