2188949771 has 2 divisors, whose sum is σ = 2188949772. Its totient is φ = 2188949770.

The previous prime is 2188949761. The next prime is 2188949843. The reversal of 2188949771 is 1779498812.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2188949771 is a prime.

It is not a weakly prime, because it can be changed into another prime (2188949731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094474885 + 1094474886.

It is an arithmetic number, because the mean of its divisors is an integer number (1094474886).

Almost surely, 2^2188949771 is an apocalyptic number.

2188949771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188949771 is an equidigital number, since it uses as much as digits as its factorization.

2188949771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 56.

The square root of 2188949771 is about 46786.2134714918. The cubic root of 2188949771 is about 1298.4102403172.

The spelling of 2188949771 in words is "two billion, one hundred eighty-eight million, nine hundred forty-nine thousand, seven hundred seventy-one".