604105561 has 4 divisors (see below), whose sum is σ = 604241572. Its totient is φ = 603969552.

The previous prime is 604105553. The next prime is 604105613. The reversal of 604105561 is 165501406.

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 288830025 + 315275536 = 16995^2 + 17756^2 .

It is a cyclic number.

It is not a de Polignac number, because 604105561 - 2³ = 604105553 is a prime.

It is a super-2 number, since 2×604105561² = 729887057662249442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (604105531) 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, 61110 + ... + 70303.

It is an arithmetic number, because the mean of its divisors is an integer number (151060393).

Almost surely, 2^604105561 is an apocalyptic number.

It is an amenable number.

604105561 is a deficient number, since it is larger than the sum of its proper divisors (136011).

604105561 is a wasteful number, since it uses less digits than its factorization.

604105561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136010.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 604105561 is about 24578.5589691503. The cubic root of 604105561 is about 845.3520519902.

Adding to 604105561 its reverse (165501406), we get a palindrome (769606967).

The spelling of 604105561 in words is "six hundred four million, one hundred five thousand, five hundred sixty-one".