3847472561 has 2 divisors, whose sum is σ = 3847472562. Its totient is φ = 3847472560.

The previous prime is 3847472557. The next prime is 3847472569. The reversal of 3847472561 is 1652747483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2097640000 + 1749832561 = 45800^2 + 41831^2 .

It is a cyclic number.

It is not a de Polignac number, because 3847472561 - 2² = 3847472557 is a prime.

It is not a weakly prime, because it can be changed into another prime (3847472569) 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 as a sum of consecutive naturals, namely, 1923736280 + 1923736281.

It is an arithmetic number, because the mean of its divisors is an integer number (1923736281).

Almost surely, 2^3847472561 is an apocalyptic number.

It is an amenable number.

3847472561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3847472561 is an equidigital number, since it uses as much as digits as its factorization.

3847472561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 47.

The square root of 3847472561 is about 62027.9982024247. The cubic root of 3847472561 is about 1566.9621652104.

The spelling of 3847472561 in words is "three billion, eight hundred forty-seven million, four hundred seventy-two thousand, five hundred sixty-one".