104561 has 2 divisors, whose sum is σ = 104562. Its totient is φ = 104560.

The previous prime is 104551. The next prime is 104579. The reversal of 104561 is 165401.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78961 + 25600 = 281^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 104561 - 2¹⁴ = 88177 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52280 + 52281.

It is an arithmetic number, because the mean of its divisors is an integer number (52281).

2¹⁰⁴⁵⁶¹ is an apocalyptic number.

It is an amenable number.

104561 is a deficient number, since it is larger than the sum of its proper divisors (1).

104561 is an equidigital number, since it uses as much as digits as its factorization.

104561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 104561 is about 323.3589336944. The cubic root of 104561 is about 47.1110997801. Note that the first 3 decimals are identical.

Adding to 104561 its reverse (165401), we get a palindrome (269962).

The spelling of 104561 in words is "one hundred four thousand, five hundred sixty-one".