5561761 has 4 divisors (see below), whose sum is σ = 5569300. Its totient is φ = 5554224.

The previous prime is 5561719. The next prime is 5561779. The reversal of 5561761 is 1671655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1671655 = 5 ⋅334331.

It can be written as a sum of positive squares in 2 ways, for example, as 3444736 + 2117025 = 1856^2 + 1455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5561761 is a prime.

It is a super-2 number, since 2×5561761² = 61866370842242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5561701) 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, 2526 + ... + 4183.

It is an arithmetic number, because the mean of its divisors is an integer number (1392325).

Almost surely, 2^5561761 is an apocalyptic number.

It is an amenable number.

5561761 is a deficient number, since it is larger than the sum of its proper divisors (7539).

5561761 is an equidigital number, since it uses as much as digits as its factorization.

5561761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7538.

The product of its digits is 6300, while the sum is 31.

The square root of 5561761 is about 2358.3386101237. The cubic root of 5561761 is about 177.1756796806.

It can be divided in two parts, 55 and 61761, that added together give a palindrome (61816).

The spelling of 5561761 in words is "five million, five hundred sixty-one thousand, seven hundred sixty-one".