605561321 has 4 divisors (see below), whose sum is σ = 605728644. Its totient is φ = 605394000.

The previous prime is 605561311. The next prime is 605561329. The reversal of 605561321 is 123165506.

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 113209600 + 492351721 = 10640^2 + 22189^2 .

It is a cyclic number.

It is not a de Polignac number, because 605561321 - 2¹⁴ = 605544937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (605561329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78110 + ... + 85511.

It is an arithmetic number, because the mean of its divisors is an integer number (151432161).

Almost surely, 2^605561321 is an apocalyptic number.

It is an amenable number.

605561321 is a deficient number, since it is larger than the sum of its proper divisors (167323).

605561321 is a wasteful number, since it uses less digits than its factorization.

605561321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167322.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 605561321 is about 24608.1555789945. The cubic root of 605561321 is about 846.0305440669.

It can be divided in two parts, 6055 and 61321, that added together give a palindrome (67376).

The spelling of 605561321 in words is "six hundred five million, five hundred sixty-one thousand, three hundred twenty-one".