5561161 has 4 divisors (see below), whose sum is σ = 5616324. Its totient is φ = 5506000.

The previous prime is 5561141. The next prime is 5561189. The reversal of 5561161 is 1611655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4227136 + 1334025 = 2056^2 + 1155^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561161 - 2¹⁹ = 5036873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5561141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27430 + ... + 27631.

It is an arithmetic number, because the mean of its divisors is an integer number (1404081).

Almost surely, 2^5561161 is an apocalyptic number.

It is an amenable number.

5561161 is a deficient number, since it is larger than the sum of its proper divisors (55163).

5561161 is a wasteful number, since it uses less digits than its factorization.

5561161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55162.

The product of its digits is 900, while the sum is 25.

The square root of 5561161 is about 2358.2113984968. The cubic root of 5561161 is about 177.1693082435.

It can be divided in two parts, 55 and 61161, that added together give a palindrome (61216).

The spelling of 5561161 in words is "five million, five hundred sixty-one thousand, one hundred sixty-one".