2188784749 has 2 divisors, whose sum is σ = 2188784750. Its totient is φ = 2188784748.

The previous prime is 2188784707. The next prime is 2188784761. The reversal of 2188784749 is 9474878812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2112781225 + 76003524 = 45965^2 + 8718^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188784749 - 2²¹ = 2186687597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2188784693 and 2188784702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2188784789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094392374 + 1094392375.

It is an arithmetic number, because the mean of its divisors is an integer number (1094392375).

Almost surely, 2^2188784749 is an apocalyptic number.

It is an amenable number.

2188784749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188784749 is an equidigital number, since it uses as much as digits as its factorization.

2188784749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7225344, while the sum is 58.

The square root of 2188784749 is about 46784.4498631757. The cubic root of 2188784749 is about 1298.3776110258.

The spelling of 2188784749 in words is "two billion, one hundred eighty-eight million, seven hundred eighty-four thousand, seven hundred forty-nine".