561655039 has 4 divisors (see below), whose sum is σ = 612714600. Its totient is φ = 510595480.

The previous prime is 561655007. The next prime is 561655049. The reversal of 561655039 is 930556165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 561655039 - 2⁵ = 561655007 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561654992 and 561655010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561655049) 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, 25529764 + ... + 25529785.

It is an arithmetic number, because the mean of its divisors is an integer number (153178650).

Almost surely, 2^561655039 is an apocalyptic number.

561655039 is a deficient number, since it is larger than the sum of its proper divisors (51059561).

561655039 is a wasteful number, since it uses less digits than its factorization.

561655039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51059560.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 561655039 is about 23699.2624146829. The cubic root of 561655039 is about 825.0682717912.

The spelling of 561655039 in words is "five hundred sixty-one million, six hundred fifty-five thousand, thirty-nine".