42521505 has 64 divisors (see below), whose sum is σ = 78962688. Its totient is φ = 19353600.

The previous prime is 42521489. The next prime is 42521509. The reversal of 42521505 is 50512524.

It is a happy number.

It is not a de Polignac number, because 42521505 - 2⁴ = 42521489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42521509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 334752 + ... + 334878.

It is an arithmetic number, because the mean of its divisors is an integer number (1233792).

Almost surely, 2^42521505 is an apocalyptic number.

It is an amenable number.

42521505 is a deficient number, since it is larger than the sum of its proper divisors (36441183).

42521505 is a wasteful number, since it uses less digits than its factorization.

42521505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 42521505 is about 6520.8515548201. The cubic root of 42521505 is about 349.0354531407.

The spelling of 42521505 in words is "forty-two million, five hundred twenty-one thousand, five hundred five".