561999969 has 12 divisors (see below), whose sum is σ = 827094996. Its totient is φ = 367597152.

The previous prime is 561999959. The next prime is 561999973. The reversal of 561999969 is 969999165.

561999969 is a `hidden beast` number, since 5 + 619 + 9 + 9 + 9 + 6 + 9 = 666.

561999969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 136609344 + 425390625 = 11688^2 + 20625^2 .

It is not a de Polignac number, because 561999969 - 2⁵ = 561999937 is a prime.

It is a super-2 number, since 2×561999969² = 631687930312001922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (561999929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 588622 + ... + 589575.

It is an arithmetic number, because the mean of its divisors is an integer number (68924583).

Almost surely, 2^561999969 is an apocalyptic number.

It is an amenable number.

561999969 is a deficient number, since it is larger than the sum of its proper divisors (265095027).

561999969 is a wasteful number, since it uses less digits than its factorization.

561999969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178256 (or 1178253 counting only the distinct ones).

The product of its digits is 10628820, while the sum is 63.

The square root of 561999969 is about 23706.5385284313. The cubic root of 561999969 is about 825.2371373405.

The spelling of 561999969 in words is "five hundred sixty-one million, nine hundred ninety-nine thousand, nine hundred sixty-nine".