561838439 has 2 divisors, whose sum is σ = 561838440. Its totient is φ = 561838438.

The previous prime is 561838391. The next prime is 561838463. The reversal of 561838439 is 934838165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561838439 - 2⁸ = 561838183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561838393 and 561838402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561838339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280919219 + 280919220.

It is an arithmetic number, because the mean of its divisors is an integer number (280919220).

Almost surely, 2^561838439 is an apocalyptic number.

561838439 is a deficient number, since it is larger than the sum of its proper divisors (1).

561838439 is an equidigital number, since it uses as much as digits as its factorization.

561838439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 47.

The square root of 561838439 is about 23703.1314175997. The cubic root of 561838439 is about 825.1580665604.

The spelling of 561838439 in words is "five hundred sixty-one million, eight hundred thirty-eight thousand, four hundred thirty-nine".