1000122191 has 2 divisors, whose sum is σ = 1000122192. Its totient is φ = 1000122190.

The previous prime is 1000122161. The next prime is 1000122239. The reversal of 1000122191 is 1912210001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000122191 - 2²² = 995927887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000122161) 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, 500061095 + 500061096.

It is an arithmetic number, because the mean of its divisors is an integer number (500061096).

Almost surely, 2^1000122191 is an apocalyptic number.

1000122191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000122191 is an equidigital number, since it uses as much as digits as its factorization.

1000122191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1000122191 is about 31624.7085520167. The cubic root of 1000122191 is about 1000.0407286745.

Adding to 1000122191 its reverse (1912210001), we get a palindrome (2912332192).

The spelling of 1000122191 in words is "one billion, one hundred twenty-two thousand, one hundred ninety-one".