1029991211 has 2 divisors, whose sum is σ = 1029991212. Its totient is φ = 1029991210.

The previous prime is 1029991199. The next prime is 1029991219. The reversal of 1029991211 is 1121999201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1029991211 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1029991219) 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, 514995605 + 514995606.

It is an arithmetic number, because the mean of its divisors is an integer number (514995606).

Almost surely, 2^1029991211 is an apocalyptic number.

1029991211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1029991211 is an equidigital number, since it uses as much as digits as its factorization.

1029991211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 1029991211 is about 32093.4761439144. The cubic root of 1029991211 is about 1009.8987615416.

The spelling of 1029991211 in words is "one billion, twenty-nine million, nine hundred ninety-one thousand, two hundred eleven".