2847187661 has 2 divisors, whose sum is σ = 2847187662. Its totient is φ = 2847187660.

The previous prime is 2847187649. The next prime is 2847187699. The reversal of 2847187661 is 1667817482.

It is a happy number.

2847187661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2413756900 + 433430761 = 49130^2 + 20819^2 .

It is a cyclic number.

It is not a de Polignac number, because 2847187661 - 2¹⁰ = 2847186637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2847187061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1423593830 + 1423593831.

It is an arithmetic number, because the mean of its divisors is an integer number (1423593831).

Almost surely, 2^2847187661 is an apocalyptic number.

It is an amenable number.

2847187661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2847187661 is an equidigital number, since it uses as much as digits as its factorization.

2847187661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 50.

The square root of 2847187661 is about 53359.0447909256. The cubic root of 2847187661 is about 1417.3334306750. Note that the first 3 decimals are identical.

The spelling of 2847187661 in words is "two billion, eight hundred forty-seven million, one hundred eighty-seven thousand, six hundred sixty-one".