42531805 has 4 divisors (see below), whose sum is σ = 51038172. Its totient is φ = 34025440.

The previous prime is 42531793. The next prime is 42531809. The reversal of 42531805 is 50813524.

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 16867449 + 25664356 = 4107^2 + 5066^2 .

It is not a de Polignac number, because 42531805 - 2¹⁷ = 42400733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42531809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4253176 + ... + 4253185.

It is an arithmetic number, because the mean of its divisors is an integer number (12759543).

Almost surely, 2^42531805 is an apocalyptic number.

It is an amenable number.

42531805 is a deficient number, since it is larger than the sum of its proper divisors (8506367).

42531805 is an equidigital number, since it uses as much as digits as its factorization.

42531805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8506366.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 42531805 is about 6521.6412811500. The cubic root of 42531805 is about 349.0636331947.

The spelling of 42531805 in words is "forty-two million, five hundred thirty-one thousand, eight hundred five".