1208206561 has 16 divisors (see below), whose sum is σ = 1303568640. Its totient is φ = 1116113040.

The previous prime is 1208206553. The next prime is 1208206577. The reversal of 1208206561 is 1656028021.

It is a cyclic number.

It is not a de Polignac number, because 1208206561 - 2³ = 1208206553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1208206591) 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 15 ways as a sum of consecutive naturals, for example, 792546 + ... + 794068.

It is an arithmetic number, because the mean of its divisors is an integer number (81473040).

Almost surely, 2^1208206561 is an apocalyptic number.

It is an amenable number.

1208206561 is a deficient number, since it is larger than the sum of its proper divisors (95362079).

1208206561 is a wasteful number, since it uses less digits than its factorization.

1208206561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1208206561 is about 34759.2658294159. The cubic root of 1208206561 is about 1065.0755046500.

The spelling of 1208206561 in words is "one billion, two hundred eight million, two hundred six thousand, five hundred sixty-one".