2077191689 has 2 divisors, whose sum is σ = 2077191690. Its totient is φ = 2077191688.

The previous prime is 2077191667. The next prime is 2077191707. The reversal of 2077191689 is 9861917702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1858299664 + 218892025 = 43108^2 + 14795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2077191689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2077191619) 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, 1038595844 + 1038595845.

It is an arithmetic number, because the mean of its divisors is an integer number (1038595845).

Almost surely, 2^2077191689 is an apocalyptic number.

It is an amenable number.

2077191689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2077191689 is an equidigital number, since it uses as much as digits as its factorization.

2077191689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 50.

The square root of 2077191689 is about 45576.2184587532. The cubic root of 2077191689 is about 1275.9261120218.

The spelling of 2077191689 in words is "two billion, seventy-seven million, one hundred ninety-one thousand, six hundred eighty-nine".