5561109 has 8 divisors (see below), whose sum is σ = 8238720. Its totient is φ = 3707388.

The previous prime is 5561099. The next prime is 5561119. The reversal of 5561109 is 9011655.

5561109 is a `hidden beast` number, since 556 + 1 + 109 = 666.

It is an interprime number because it is at equal distance from previous prime (5561099) and next prime (5561119).

It is not a de Polignac number, because 5561109 - 2⁵ = 5561077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 205967 = 5561109 / (5 + 5 + 6 + 1 + 1 + 0 + 9).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561119) 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, 102957 + ... + 103010.

It is an arithmetic number, because the mean of its divisors is an integer number (1029840).

Almost surely, 2^5561109 is an apocalyptic number.

It is an amenable number.

5561109 is a deficient number, since it is larger than the sum of its proper divisors (2677611).

5561109 is a wasteful number, since it uses less digits than its factorization.

5561109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205976 (or 205970 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 5561109 is about 2358.2003731659. The cubic root of 5561109 is about 177.1687560307.

The spelling of 5561109 in words is "five million, five hundred sixty-one thousand, one hundred nine".