561601601 has 16 divisors (see below), whose sum is σ = 646157760. Its totient is φ = 482734080.

The previous prime is 561601583. The next prime is 561601619. The reversal of 561601601 is 106106165.

It is an interprime number because it is at equal distance from previous prime (561601583) and next prime (561601619).

It is a cyclic number.

It is not a de Polignac number, because 561601601 - 2¹⁴ = 561585217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561600601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118265 + ... + 122921.

It is an arithmetic number, because the mean of its divisors is an integer number (40384860).

Almost surely, 2^561601601 is an apocalyptic number.

It is an amenable number.

561601601 is a deficient number, since it is larger than the sum of its proper divisors (84556159).

561601601 is a wasteful number, since it uses less digits than its factorization.

561601601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 561601601 is about 23698.1349688114. The cubic root of 561601601 is about 825.0421042485.

Adding to 561601601 its reverse (106106165), we get a palindrome (667707766).

The spelling of 561601601 in words is "five hundred sixty-one million, six hundred one thousand, six hundred one".