561389 has 2 divisors, whose sum is σ = 561390. Its totient is φ = 561388.

The previous prime is 561377. The next prime is 561409. The reversal of 561389 is 983165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366025 + 195364 = 605^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 561389 - 2⁴ = 561373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280694 + 280695.

It is an arithmetic number, because the mean of its divisors is an integer number (280695).

2⁵⁶¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

561389 is a deficient number, since it is larger than the sum of its proper divisors (1).

561389 is an equidigital number, since it uses as much as digits as its factorization.

561389 is an odious number, because the sum of its binary digits is odd.

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

The square root of 561389 is about 749.2589672470. The cubic root of 561389 is about 82.4937981258.

The spelling of 561389 in words is "five hundred sixty-one thousand, three hundred eighty-nine".