561232403 has 4 divisors (see below), whose sum is σ = 561417528. Its totient is φ = 561047280.

The previous prime is 561232379. The next prime is 561232409. The reversal of 561232403 is 304232165.

561232403 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 561232403 - 2¹⁸ = 560970259 is a prime.

It is a super-3 number, since 3×561232403³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561232409) 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, 87938 + ... + 94103.

It is an arithmetic number, because the mean of its divisors is an integer number (140354382).

Almost surely, 2^561232403 is an apocalyptic number.

561232403 is a deficient number, since it is larger than the sum of its proper divisors (185125).

561232403 is a wasteful number, since it uses less digits than its factorization.

561232403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185124.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 561232403 is about 23690.3440878346. The cubic root of 561232403 is about 824.8612698469.

Adding to 561232403 its reverse (304232165), we get a palindrome (865464568).

The spelling of 561232403 in words is "five hundred sixty-one million, two hundred thirty-two thousand, four hundred three".