1206206561 has 16 divisors (see below), whose sum is σ = 1422842880. Its totient is φ = 1001175120.

The previous prime is 1206206531. The next prime is 1206206569. The reversal of 1206206561 is 1656026021.

It is a cyclic number.

It is not a de Polignac number, because 1206206561 - 2³⁰ = 132464737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1206206569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5876 + ... + 49466.

It is an arithmetic number, because the mean of its divisors is an integer number (88927680).

Almost surely, 2^1206206561 is an apocalyptic number.

It is an amenable number.

1206206561 is a deficient number, since it is larger than the sum of its proper divisors (216636319).

1206206561 is an equidigital number, since it uses as much as digits as its factorization.

1206206561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43724.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1206206561 is about 34730.4846064664. The cubic root of 1206206561 is about 1064.4874905529.

The spelling of 1206206561 in words is "one billion, two hundred six million, two hundred six thousand, five hundred sixty-one".