42319521 has 6 divisors (see below), whose sum is σ = 61128210. Its totient is φ = 28213008.

The previous prime is 42319513. The next prime is 42319531. The reversal of 42319521 is 12591324.

42319521 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 only one way, i.e., 38937600 + 3381921 = 6240^2 + 1839^2 .

It is not a de Polignac number, because 42319521 - 2³ = 42319513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42319531) 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 5 ways as a sum of consecutive naturals, for example, 2351076 + ... + 2351093.

It is an arithmetic number, because the mean of its divisors is an integer number (10188035).

Almost surely, 2^42319521 is an apocalyptic number.

It is an amenable number.

42319521 is a deficient number, since it is larger than the sum of its proper divisors (18808689).

42319521 is a wasteful number, since it uses less digits than its factorization.

42319521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702175 (or 4702172 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 42319521 is about 6505.3455711438. The cubic root of 42319521 is about 348.4819175387.

The spelling of 42319521 in words is "forty-two million, three hundred nineteen thousand, five hundred twenty-one".