561941109 has 12 divisors (see below), whose sum is σ = 812944236. Its totient is φ = 374049792.

The previous prime is 561941101. The next prime is 561941113. The reversal of 561941109 is 901149165.

561941109 is a `hidden beast` number, since 561 + 94 + 1 + 1 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 124211025 + 437730084 = 11145^2 + 20922^2 .

It is not a de Polignac number, because 561941109 - 2³ = 561941101 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561941101) 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, 41932 + ... + 53685.

It is an arithmetic number, because the mean of its divisors is an integer number (67745353).

Almost surely, 2^561941109 is an apocalyptic number.

It is an amenable number.

561941109 is a deficient number, since it is larger than the sum of its proper divisors (251003127).

561941109 is a wasteful number, since it uses less digits than its factorization.

561941109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96276 (or 96273 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 561941109 is about 23705.2970662677. The cubic root of 561941109 is about 825.2083264530.

The spelling of 561941109 in words is "five hundred sixty-one million, nine hundred forty-one thousand, one hundred nine".