2891768729 has 2 divisors, whose sum is σ = 2891768730. Its totient is φ = 2891768728.

The previous prime is 2891768723. The next prime is 2891768767. The reversal of 2891768729 is 9278671982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2706808729 + 184960000 = 52027^2 + 13600^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891768729 - 2¹⁶ = 2891703193 is a prime.

It is not a weakly prime, because it can be changed into another prime (2891768723) 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, 1445884364 + 1445884365.

It is an arithmetic number, because the mean of its divisors is an integer number (1445884365).

Almost surely, 2^2891768729 is an apocalyptic number.

It is an amenable number.

2891768729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891768729 is an equidigital number, since it uses as much as digits as its factorization.

2891768729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 59.

The square root of 2891768729 is about 53775.1683307454. The cubic root of 2891768729 is about 1424.6926562367.

The spelling of 2891768729 in words is "two billion, eight hundred ninety-one million, seven hundred sixty-eight thousand, seven hundred twenty-nine".