6113561 has 4 divisors (see below), whose sum is σ = 6379392. Its totient is φ = 5847732.

The previous prime is 6113539. The next prime is 6113579. The reversal of 6113561 is 1653116.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6113561 - 2¹⁴ = 6097177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 265807 = 6113561 / (6 + 1 + 1 + 3 + 5 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6113161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132881 + ... + 132926.

It is an arithmetic number, because the mean of its divisors is an integer number (1594848).

Almost surely, 2^6113561 is an apocalyptic number.

It is an amenable number.

6113561 is a deficient number, since it is larger than the sum of its proper divisors (265831).

6113561 is a wasteful number, since it uses less digits than its factorization.

6113561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265830.

The product of its digits is 540, while the sum is 23.

The square root of 6113561 is about 2472.5616271389. The cubic root of 6113561 is about 182.8513130291.

Adding to 6113561 its reverse (1653116), we get a palindrome (7766677).

The spelling of 6113561 in words is "six million, one hundred thirteen thousand, five hundred sixty-one".