6111561 has 8 divisors (see below), whose sum is σ = 8167680. Its totient is φ = 4064912.

The previous prime is 6111527. The next prime is 6111577. The reversal of 6111561 is 1651116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6111561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6111661) 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, 690 + ... + 3563.

It is an arithmetic number, because the mean of its divisors is an integer number (1020960).

Almost surely, 2^6111561 is an apocalyptic number.

It is an amenable number.

6111561 is a deficient number, since it is larger than the sum of its proper divisors (2056119).

6111561 is a wasteful number, since it uses less digits than its factorization.

6111561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4735.

The product of its digits is 180, while the sum is 21.

The square root of 6111561 is about 2472.1571551987. The cubic root of 6111561 is about 182.8313714320.

Adding to 6111561 its reverse (1651116), we get a palindrome (7762677).

It can be divided in two parts, 6111 and 561, that multiplied together give a triangular number (3428271 = T₂₆₁₈).

The spelling of 6111561 in words is "six million, one hundred eleven thousand, five hundred sixty-one".