561101 has 2 divisors, whose sum is σ = 561102. Its totient is φ = 561100.

The previous prime is 561097. The next prime is 561103. The reversal of 561101 is 101165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561001 + 100 = 749^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 561101 - 2² = 561097 is a prime.

Together with 561103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280550 + 280551.

It is an arithmetic number, because the mean of its divisors is an integer number (280551).

2⁵⁶¹¹⁰¹ is an apocalyptic number.

It is an amenable number.

561101 is a deficient number, since it is larger than the sum of its proper divisors (1).

561101 is an equidigital number, since it uses as much as digits as its factorization.

561101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 561101 is about 749.0667526997. The cubic root of 561101 is about 82.4796889087.

Adding to 561101 its reverse (101165), we get a palindrome (662266).

The spelling of 561101 in words is "five hundred sixty-one thousand, one hundred one".