1000122120091 has 2 divisors, whose sum is σ = 1000122120092. Its totient is φ = 1000122120090.

The previous prime is 1000122120089. The next prime is 1000122120113. The reversal of 1000122120091 is 1900212210001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000122120091 - 2¹ = 1000122120089 is a prime.

Together with 1000122120089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1000122120391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500061060045 + 500061060046.

It is an arithmetic number, because the mean of its divisors is an integer number (500061060046).

Almost surely, 2^{1000122120091} is an apocalyptic number.

1000122120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000122120091 is an equidigital number, since it uses as much as digits as its factorization.

1000122120091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1000122120091 its reverse (1900212210001), we get a palindrome (2900334330092).

The spelling of 1000122120091 in words is "one trillion, one hundred twenty-two million, one hundred twenty thousand, ninety-one".