561003509 has 8 divisors (see below), whose sum is σ = 628544928. Its totient is φ = 496218960.

The previous prime is 561003491. The next prime is 561003523. The reversal of 561003509 is 905300165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561003509 - 2¹⁶ = 560937973 is a prime.

It is a super-2 number, since 2×561003509² = 629449874220626162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561003539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688787 + ... + 689600.

It is an arithmetic number, because the mean of its divisors is an integer number (78568116).

Almost surely, 2^561003509 is an apocalyptic number.

It is an amenable number.

561003509 is a deficient number, since it is larger than the sum of its proper divisors (67541419).

561003509 is a wasteful number, since it uses less digits than its factorization.

561003509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378435.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 561003509 is about 23685.5126395862. The cubic root of 561003509 is about 824.7491169800.

The spelling of 561003509 in words is "five hundred sixty-one million, three thousand, five hundred nine".