561439 has 2 divisors, whose sum is σ = 561440. Its totient is φ = 561438.

The previous prime is 561419. The next prime is 561461. The reversal of 561439 is 934165.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280719 + 280720.

It is an arithmetic number, because the mean of its divisors is an integer number (280720).

2⁵⁶¹⁴³⁹ is an apocalyptic number.

561439 is a deficient number, since it is larger than the sum of its proper divisors (1).

561439 is an equidigital number, since it uses as much as digits as its factorization.

561439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 28.

The square root of 561439 is about 749.2923328048. The cubic root of 561439 is about 82.4962471510.

It can be divided in two parts, 561 and 439, that added together give a cube (1000 = 10³).

The spelling of 561439 in words is "five hundred sixty-one thousand, four hundred thirty-nine".