561671405 has 4 divisors (see below), whose sum is σ = 674005692. Its totient is φ = 449337120.

The previous prime is 561671389. The next prime is 561671413. The reversal of 561671405 is 504176165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 220641316 + 341030089 = 14854^2 + 18467^2 .

It is not a de Polignac number, because 561671405 - 2⁴ = 561671389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56167136 + ... + 56167145.

It is an arithmetic number, because the mean of its divisors is an integer number (168501423).

Almost surely, 2^561671405 is an apocalyptic number.

It is an amenable number.

561671405 is a deficient number, since it is larger than the sum of its proper divisors (112334287).

561671405 is a wasteful number, since it uses less digits than its factorization.

561671405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112334286.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 561671405 is about 23699.6076971751. The cubic root of 561671405 is about 825.0762855691.

The spelling of 561671405 in words is "five hundred sixty-one million, six hundred seventy-one thousand, four hundred five".