42103609 has 4 divisors (see below), whose sum is σ = 42121204. Its totient is φ = 42086016.

The previous prime is 42103541. The next prime is 42103613. The reversal of 42103609 is 90630124.

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 32319225 + 9784384 = 5685^2 + 3128^2 .

It is a cyclic number.

It is not a de Polignac number, because 42103609 - 2¹¹ = 42101561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42103309) 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, 4512 + ... + 10225.

It is an arithmetic number, because the mean of its divisors is an integer number (10530301).

Almost surely, 2^42103609 is an apocalyptic number.

It is an amenable number.

42103609 is a deficient number, since it is larger than the sum of its proper divisors (17595).

42103609 is a wasteful number, since it uses less digits than its factorization.

42103609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17594.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 42103609 is about 6488.7293825525. The cubic root of 42103609 is about 347.8882612368. Note that the first 3 decimals are identical.

The spelling of 42103609 in words is "forty-two million, one hundred three thousand, six hundred nine".