561671439 has 16 divisors (see below), whose sum is σ = 856381440. Its totient is φ = 320767200.

The previous prime is 561671413. The next prime is 561671447. The reversal of 561671439 is 934176165.

It is not a de Polignac number, because 561671439 - 2⁸ = 561671183 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561671439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561671459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34117 + ... + 47825.

It is an arithmetic number, because the mean of its divisors is an integer number (53523840).

Almost surely, 2^561671439 is an apocalyptic number.

561671439 is a deficient number, since it is larger than the sum of its proper divisors (294710001).

561671439 is a wasteful number, since it uses less digits than its factorization.

561671439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15670.

The product of its digits is 136080, while the sum is 42.

The square root of 561671439 is about 23699.6084144865. The cubic root of 561671439 is about 825.0763022173.

The spelling of 561671439 in words is "five hundred sixty-one million, six hundred seventy-one thousand, four hundred thirty-nine".