561156005 has 4 divisors (see below), whose sum is σ = 673387212. Its totient is φ = 448924800.

The previous prime is 561155993. The next prime is 561156007. The reversal of 561156005 is 500651165.

561156005 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.

It can be written as a sum of positive squares in 2 ways, for example, as 60202081 + 500953924 = 7759^2 + 22382^2 .

It is not a de Polignac number, because 561156005 - 2¹⁰ = 561154981 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 (561156007) 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, 56115596 + ... + 56115605.

It is an arithmetic number, because the mean of its divisors is an integer number (168346803).

Almost surely, 2^561156005 is an apocalyptic number.

It is an amenable number.

561156005 is a deficient number, since it is larger than the sum of its proper divisors (112231207).

561156005 is a wasteful number, since it uses less digits than its factorization.

561156005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112231206.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 561156005 is about 23688.7316038660. The cubic root of 561156005 is about 824.8238399512.

It can be divided in two parts, 5611 and 56005, that added together give a palindrome (61616).

The spelling of 561156005 in words is "five hundred sixty-one million, one hundred fifty-six thousand, five".