604661209 has 4 divisors (see below), whose sum is σ = 604773540. Its totient is φ = 604548880.

The previous prime is 604661207. The next prime is 604661243. The reversal of 604661209 is 902166406.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902166406 = 2 ⋅451083203.

It can be written as a sum of positive squares in 2 ways, for example, as 326705625 + 277955584 = 18075^2 + 16672^2 .

It is a cyclic number.

It is not a de Polignac number, because 604661209 - 2¹ = 604661207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (604661207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47662 + ... + 58999.

It is an arithmetic number, because the mean of its divisors is an integer number (151193385).

Almost surely, 2^604661209 is an apocalyptic number.

It is an amenable number.

604661209 is a deficient number, since it is larger than the sum of its proper divisors (112331).

604661209 is a wasteful number, since it uses less digits than its factorization.

604661209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112330.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 604661209 is about 24589.8598816667. The cubic root of 604661209 is about 845.6111536370.

The spelling of 604661209 in words is "six hundred four million, six hundred sixty-one thousand, two hundred nine".