561655213 has 8 divisors (see below), whose sum is σ = 644178240. Its totient is φ = 479703840.

The previous prime is 561655183. The next prime is 561655229. The reversal of 561655213 is 312556165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561655213 - 2⁹ = 561654701 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 (561655513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140803 + ... + 144736.

It is an arithmetic number, because the mean of its divisors is an integer number (80522280).

Almost surely, 2^561655213 is an apocalyptic number.

It is an amenable number.

561655213 is a deficient number, since it is larger than the sum of its proper divisors (82523027).

561655213 is a wasteful number, since it uses less digits than its factorization.

561655213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285827.

The product of its digits is 27000, while the sum is 34.

The square root of 561655213 is about 23699.2660856829. The cubic root of 561655213 is about 825.0683569929.

The spelling of 561655213 in words is "five hundred sixty-one million, six hundred fifty-five thousand, two hundred thirteen".