561547 has 4 divisors (see below), whose sum is σ = 641776. Its totient is φ = 481320.

The previous prime is 561529. The next prime is 561551. The reversal of 561547 is 745165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745165 = 5 ⋅149033.

It is not a de Polignac number, because 561547 - 2⁷ = 561419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40104 + ... + 40117.

It is an arithmetic number, because the mean of its divisors is an integer number (160444).

2⁵⁶¹⁵⁴⁷ is an apocalyptic number.

561547 is a deficient number, since it is larger than the sum of its proper divisors (80229).

561547 is an equidigital number, since it uses as much as digits as its factorization.

561547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80228.

The product of its digits is 4200, while the sum is 28.

The square root of 561547 is about 749.3643973395. The cubic root of 561547 is about 82.5015365493.

The spelling of 561547 in words is "five hundred sixty-one thousand, five hundred forty-seven".