2189094779 has 2 divisors, whose sum is σ = 2189094780. Its totient is φ = 2189094778.

The previous prime is 2189094767. The next prime is 2189094781. The reversal of 2189094779 is 9774909812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2189094779 is a prime.

Together with 2189094781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2189094179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094547389 + 1094547390.

It is an arithmetic number, because the mean of its divisors is an integer number (1094547390).

Almost surely, 2^2189094779 is an apocalyptic number.

2189094779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189094779 is an equidigital number, since it uses as much as digits as its factorization.

2189094779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The square root of 2189094779 is about 46787.7631331099. The cubic root of 2189094779 is about 1298.4389109484.

The spelling of 2189094779 in words is "two billion, one hundred eighty-nine million, ninety-four thousand, seven hundred seventy-nine".