1121899091 has 2 divisors, whose sum is σ = 1121899092. Its totient is φ = 1121899090.

The previous prime is 1121899081. The next prime is 1121899109. The reversal of 1121899091 is 1909981211.

Together with next prime (1121899109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (1909981211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121899091 - 2¹⁰ = 1121898067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1121899001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560949545 + 560949546.

It is an arithmetic number, because the mean of its divisors is an integer number (560949546).

Almost surely, 2^1121899091 is an apocalyptic number.

1121899091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121899091 is an equidigital number, since it uses as much as digits as its factorization.

1121899091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 41.

The square root of 1121899091 is about 33494.7621427590. The cubic root of 1121899091 is about 1039.0854543320.

The spelling of 1121899091 in words is "one billion, one hundred twenty-one million, eight hundred ninety-nine thousand, ninety-one".