42115609 has 4 divisors (see below), whose sum is σ = 44332240. Its totient is φ = 39898980.

The previous prime is 42115607. The next prime is 42115637. The reversal of 42115609 is 90651124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42115609 - 2¹ = 42115607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42115607) 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, 1108287 + ... + 1108324.

It is an arithmetic number, because the mean of its divisors is an integer number (11083060).

Almost surely, 2^42115609 is an apocalyptic number.

It is an amenable number.

42115609 is a deficient number, since it is larger than the sum of its proper divisors (2216631).

42115609 is a wasteful number, since it uses less digits than its factorization.

42115609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216630.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 42115609 is about 6489.6539969401. The cubic root of 42115609 is about 347.9213087807.

It can be divided in two parts, 42115 and 609, that added together give a palindrome (42724).

The spelling of 42115609 in words is "forty-two million, one hundred fifteen thousand, six hundred nine".