561209733 has 12 divisors (see below), whose sum is σ = 926441568. Its totient is φ = 320691240.

The previous prime is 561209731. The next prime is 561209767. The reversal of 561209733 is 337902165.

561209733 is a `hidden beast` number, since 5 + 612 + 0 + 9 + 7 + 33 = 666.

It is not a de Polignac number, because 561209733 - 2¹ = 561209731 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561209731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4453983 + ... + 4454108.

It is an arithmetic number, because the mean of its divisors is an integer number (77203464).

Almost surely, 2^561209733 is an apocalyptic number.

It is an amenable number.

561209733 is a deficient number, since it is larger than the sum of its proper divisors (365231835).

561209733 is a wasteful number, since it uses less digits than its factorization.

561209733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8908104 (or 8908101 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 561209733 is about 23689.8656180232. The cubic root of 561209733 is about 824.8501634219.

The spelling of 561209733 in words is "five hundred sixty-one million, two hundred nine thousand, seven hundred thirty-three".