561403 has 4 divisors (see below), whose sum is σ = 563760. Its totient is φ = 559048.

The previous prime is 561389. The next prime is 561409. The reversal of 561403 is 304165.

561403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 561403 - 2⁹ = 560891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561409) 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, 775 + ... + 1312.

It is an arithmetic number, because the mean of its divisors is an integer number (140940).

2⁵⁶¹⁴⁰³ is an apocalyptic number.

561403 is a deficient number, since it is larger than the sum of its proper divisors (2357).

561403 is a wasteful number, since it uses less digits than its factorization.

561403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 561403 is about 749.2683097529. The cubic root of 561403 is about 82.4944838675.

Adding to 561403 its reverse (304165), we get a palindrome (865568).

The spelling of 561403 in words is "five hundred sixty-one thousand, four hundred three".