6211120561 has 4 divisors (see below), whose sum is σ = 6576480612. Its totient is φ = 5845760512.

The previous prime is 6211120549. The next prime is 6211120579. The reversal of 6211120561 is 1650211126.

It is a happy number.

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 4499726400 + 1711394161 = 67080^2 + 41369^2 .

It is a cyclic number.

It is not a de Polignac number, because 6211120561 - 2⁵ = 6211120529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6211126561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182680000 + ... + 182680033.

It is an arithmetic number, because the mean of its divisors is an integer number (1644120153).

Almost surely, 2^6211120561 is an apocalyptic number.

It is an amenable number.

6211120561 is a deficient number, since it is larger than the sum of its proper divisors (365360051).

6211120561 is a wasteful number, since it uses less digits than its factorization.

6211120561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365360050.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 6211120561 is about 78810.6627367135. The cubic root of 6211120561 is about 1838.1882529880.

Adding to 6211120561 its reverse (1650211126), we get a palindrome (7861331687).

The spelling of 6211120561 in words is "six billion, two hundred eleven million, one hundred twenty thousand, five hundred sixty-one".