42513505 has 8 divisors (see below), whose sum is σ = 51143400. Its totient is φ = 33926016.

The previous prime is 42513503. The next prime is 42513509. The reversal of 42513505 is 50531524.

It can be written as a sum of positive squares in 4 ways, for example, as 21196816 + 21316689 = 4604^2 + 4617^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42513505 - 2¹ = 42513503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42513505.

It is not an unprimeable number, because it can be changed into a prime (42513503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8350 + ... + 12439.

It is an arithmetic number, because the mean of its divisors is an integer number (6392925).

Almost surely, 2^42513505 is an apocalyptic number.

It is an amenable number.

42513505 is a deficient number, since it is larger than the sum of its proper divisors (8629895).

42513505 is a wasteful number, since it uses less digits than its factorization.

42513505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21203.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 42513505 is about 6520.2381091491. The cubic root of 42513505 is about 349.0135625800.

The spelling of 42513505 in words is "forty-two million, five hundred thirteen thousand, five hundred five".