2291819879 has 2 divisors, whose sum is σ = 2291819880. Its totient is φ = 2291819878.

The previous prime is 2291819857. The next prime is 2291819897. The reversal of 2291819879 is 9789181922.

Together with next prime (2291819897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2291819879 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2291819899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145909939 + 1145909940.

It is an arithmetic number, because the mean of its divisors is an integer number (1145909940).

Almost surely, 2^2291819879 is an apocalyptic number.

2291819879 is a deficient number, since it is larger than the sum of its proper divisors (1).

2291819879 is an equidigital number, since it uses as much as digits as its factorization.

2291819879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 56.

The square root of 2291819879 is about 47872.9556117021. The cubic root of 2291819879 is about 1318.4393629232.

The spelling of 2291819879 in words is "two billion, two hundred ninety-one million, eight hundred nineteen thousand, eight hundred seventy-nine".