2791278109 has 2 divisors, whose sum is σ = 2791278110. Its totient is φ = 2791278108.

The previous prime is 2791278103. The next prime is 2791278143. The reversal of 2791278109 is 9018721972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2660290084 + 130988025 = 51578^2 + 11445^2 .

It is a cyclic number.

It is not a de Polignac number, because 2791278109 - 2⁹ = 2791277597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2791278103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1395639054 + 1395639055.

It is an arithmetic number, because the mean of its divisors is an integer number (1395639055).

Almost surely, 2^2791278109 is an apocalyptic number.

It is an amenable number.

2791278109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2791278109 is an equidigital number, since it uses as much as digits as its factorization.

2791278109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 2791278109 is about 52832.5478185559. The cubic root of 2791278109 is about 1407.9947534791.

It can be divided in two parts, 2791 and 278109, that added together give a square (280900 = 530²).

The spelling of 2791278109 in words is "two billion, seven hundred ninety-one million, two hundred seventy-eight thousand, one hundred nine".