2076781691 has 2 divisors, whose sum is σ = 2076781692. Its totient is φ = 2076781690.

The previous prime is 2076781639. The next prime is 2076781703. The reversal of 2076781691 is 1961876702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2076781691 - 2¹⁴ = 2076765307 is a prime.

It is not a weakly prime, because it can be changed into another prime (2076781631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1038390845 + 1038390846.

It is an arithmetic number, because the mean of its divisors is an integer number (1038390846).

Almost surely, 2^2076781691 is an apocalyptic number.

2076781691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2076781691 is an equidigital number, since it uses as much as digits as its factorization.

2076781691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 2076781691 is about 45571.7202988871. The cubic root of 2076781691 is about 1275.8421586760.

The spelling of 2076781691 in words is "two billion, seventy-six million, seven hundred eighty-one thousand, six hundred ninety-one".