610005561 has 16 divisors (see below), whose sum is σ = 894060288. Its totient is φ = 366875600.

The previous prime is 610005497. The next prime is 610005589. The reversal of 610005561 is 165500016.

It is a cyclic number.

It is not a de Polignac number, because 610005561 - 2⁶ = 610005497 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (610005061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66231 + ... + 74876.

It is an arithmetic number, because the mean of its divisors is an integer number (55878768).

Almost surely, 2^610005561 is an apocalyptic number.

It is an amenable number.

610005561 is a deficient number, since it is larger than the sum of its proper divisors (284054727).

610005561 is a wasteful number, since it uses less digits than its factorization.

610005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141252.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 610005561 is about 24698.2906493547. The cubic root of 610005561 is about 848.0951860229.

Adding to 610005561 its reverse (165500016), we get a palindrome (775505577).

The spelling of 610005561 in words is "six hundred ten million, five thousand, five hundred sixty-one".