561555523 has 8 divisors (see below), whose sum is σ = 565956720. Its totient is φ = 557172000.

The previous prime is 561555487. The next prime is 561555529. The reversal of 561555523 is 325555165.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561555523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561555529) 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, 63361 + ... + 71677.

It is an arithmetic number, because the mean of its divisors is an integer number (70744590).

Almost surely, 2^561555523 is an apocalyptic number.

561555523 is a deficient number, since it is larger than the sum of its proper divisors (4401197).

561555523 is a wasteful number, since it uses less digits than its factorization.

561555523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8837.

The product of its digits is 112500, while the sum is 37.

The square root of 561555523 is about 23697.1627626600. The cubic root of 561555523 is about 825.0195394209.

The spelling of 561555523 in words is "five hundred sixty-one million, five hundred fifty-five thousand, five hundred twenty-three".