2261127779 has 2 divisors, whose sum is σ = 2261127780. Its totient is φ = 2261127778.

The previous prime is 2261127773. The next prime is 2261127797. The reversal of 2261127779 is 9777211622.

Together with next prime (2261127797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2261127779 is a prime.

It is a super-2 number, since 2×2261127779² = 10225397665930945682, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2261127773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130563889 + 1130563890.

It is an arithmetic number, because the mean of its divisors is an integer number (1130563890).

Almost surely, 2^2261127779 is an apocalyptic number.

2261127779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2261127779 is an equidigital number, since it uses as much as digits as its factorization.

2261127779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 44.

The square root of 2261127779 is about 47551.3173213950. The cubic root of 2261127779 is about 1312.5273701201.

The spelling of 2261127779 in words is "two billion, two hundred sixty-one million, one hundred twenty-seven thousand, seven hundred seventy-nine".