561204013 has 4 divisors (see below), whose sum is σ = 561837600. Its totient is φ = 560570428.

The previous prime is 561204011. The next prime is 561204037. The reversal of 561204013 is 310402165.

561204013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 561204013 - 2¹ = 561204011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561204011) 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, 315463 + ... + 317236.

It is an arithmetic number, because the mean of its divisors is an integer number (140459400).

Almost surely, 2^561204013 is an apocalyptic number.

It is an amenable number.

561204013 is a deficient number, since it is larger than the sum of its proper divisors (633587).

561204013 is an equidigital number, since it uses as much as digits as its factorization.

561204013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633586.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 561204013 is about 23689.7448909861. The cubic root of 561204013 is about 824.8473610478.

Adding to 561204013 its reverse (310402165), we get a palindrome (871606178).

The spelling of 561204013 in words is "five hundred sixty-one million, two hundred four thousand, thirteen".