561026561 has 8 divisors (see below), whose sum is σ = 579398400. Its totient is φ = 542671920.

The previous prime is 561026539. The next prime is 561026567. The reversal of 561026561 is 165620165.

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-561026561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561026567) 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, 114755 + ... + 119543.

It is an arithmetic number, because the mean of its divisors is an integer number (72424800).

Almost surely, 2^561026561 is an apocalyptic number.

It is an amenable number.

561026561 is a deficient number, since it is larger than the sum of its proper divisors (18371839).

561026561 is a wasteful number, since it uses less digits than its factorization.

561026561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8599.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 561026561 is about 23685.9992611669. Note that the first 3 decimals coincide. The cubic root of 561026561 is about 824.7604133183.

The spelling of 561026561 in words is "five hundred sixty-one million, twenty-six thousand, five hundred sixty-one".