561839 has 2 divisors, whose sum is σ = 561840. Its totient is φ = 561838.

The previous prime is 561829. The next prime is 561907. The reversal of 561839 is 938165.

561839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561839 - 2¹² = 557743 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561839.

It is not a weakly prime, because it can be changed into another prime (561809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280919 + 280920.

It is an arithmetic number, because the mean of its divisors is an integer number (280920).

2⁵⁶¹⁸³⁹ is an apocalyptic number.

561839 is a deficient number, since it is larger than the sum of its proper divisors (1).

561839 is an equidigital number, since it uses as much as digits as its factorization.

561839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 561839 is about 749.5592037991. The cubic root of 561839 is about 82.5158341203.

The spelling of 561839 in words is "five hundred sixty-one thousand, eight hundred thirty-nine".