42505145 has 4 divisors (see below), whose sum is σ = 51006180. Its totient is φ = 34004112.

The previous prime is 42505121. The next prime is 42505157. The reversal of 42505145 is 54150524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14160169 + 28344976 = 3763^2 + 5324^2 .

It is a cyclic number.

It is not a de Polignac number, because 42505145 - 2²² = 38310841 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4250510 + ... + 4250519.

It is an arithmetic number, because the mean of its divisors is an integer number (12751545).

Almost surely, 2^42505145 is an apocalyptic number.

It is an amenable number.

42505145 is a deficient number, since it is larger than the sum of its proper divisors (8501035).

42505145 is an equidigital number, since it uses as much as digits as its factorization.

42505145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8501034.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 42505145 is about 6519.5969967476. The cubic root of 42505145 is about 348.9906840095.

Adding to 42505145 its reverse (54150524), we get a palindrome (96655669).

The spelling of 42505145 in words is "forty-two million, five hundred five thousand, one hundred forty-five".