2104747561 has 16 divisors (see below), whose sum is σ = 2484241920. Its totient is φ = 1745821440.

The previous prime is 2104747559. The next prime is 2104747571. The reversal of 2104747561 is 1657474012.

It is a cyclic number.

It is not a de Polignac number, because 2104747561 - 2¹ = 2104747559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2104747561.

It is not an unprimeable number, because it can be changed into a prime (2104747571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6660 + ... + 65221.

It is an arithmetic number, because the mean of its divisors is an integer number (155265120).

Almost surely, 2^2104747561 is an apocalyptic number.

It is an amenable number.

2104747561 is a deficient number, since it is larger than the sum of its proper divisors (379494359).

2104747561 is an equidigital number, since it uses as much as digits as its factorization.

2104747561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72024.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 2104747561 is about 45877.5278431609. The cubic root of 2104747561 is about 1281.5434589485.

The spelling of 2104747561 in words is "two billion, one hundred four million, seven hundred forty-seven thousand, five hundred sixty-one".